From 21290f0cbb4bbf062689b2f36d9f4518373e5559 Mon Sep 17 00:00:00 2001
From: iampratik13 <bhagwatpratik781@gmail.com>
Date: Mon, 18 May 2026 00:28:00 +0530
Subject: [PATCH 1/5] feat: add lapack/base/dlaisnan

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: passed
  - task: lint_repl_help
    status: passed
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: passed
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: passed
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: passed
  - task: lint_license_headers
    status: passed
---
---
 .../@stdlib/lapack/base/dlaisnan/README.md    | 182 ++++++++++++++++++
 .../base/dlaisnan/benchmark/benchmark.js      |  56 ++++++
 .../lapack/base/dlaisnan/docs/repl.txt        |  29 +++
 .../base/dlaisnan/docs/types/index.d.ts       |  41 ++++
 .../lapack/base/dlaisnan/docs/types/test.ts   |  56 ++++++
 .../lapack/base/dlaisnan/examples/index.js    |  31 +++
 .../@stdlib/lapack/base/dlaisnan/lib/index.js |  43 +++++
 .../@stdlib/lapack/base/dlaisnan/lib/main.js  |  53 +++++
 .../@stdlib/lapack/base/dlaisnan/package.json |  69 +++++++
 .../@stdlib/lapack/base/dlaisnan/test/test.js | 112 +++++++++++
 10 files changed, 672 insertions(+)
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
 create mode 100644 lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js

diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
new file mode 100644
index 000000000000..393748872f67
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
@@ -0,0 +1,182 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# dlaisnan
+
+> LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+```
+
+#### dlaisnan( DIN1, DIN2 )
+
+Tests whether two double-precision floating-point arguments are unequal and thus at least one is NaN.
+
+```javascript
+var bool = dlaisnan( NaN, NaN );
+// returns true
+
+bool = dlaisnan( NaN, 5.0 );
+// returns true
+
+bool = dlaisnan( 5.0, 5.0 );
+// returns false
+```
+
+The function has the following parameters:
+
+-   **DIN1**: first number to compare.
+-   **DIN2**: second number to compare.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   `dlaisnan()` corresponds to the [LAPACK][LAPACK] auxiliary routine [`dlaisnan`][lapack-dlaisnan].
+-   This routine is not for general use. It exists solely to avoid over-optimization in `disnan`.
+-   `dlaisnan` checks for NaNs by comparing its two arguments for inequality. `NaN` is the only floating-point value where `NaN != NaN` returns `true`. To check for NaNs, pass the same variable as both arguments (i.e., `dlaisnan( x, x )`).
+-   The function returns `true` whenever the two arguments are unequal, not only when one is NaN. This matches the Fortran reference implementation which simply returns `DIN1.NE.DIN2`.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+
+var opts = {
+    'dtype': 'float64'
+};
+var x = discreteUniform( 100, -50, 50, opts );
+var y = discreteUniform( 100, -50, 50, opts );
+
+logEachMap( 'dlaisnan( %d, %d ) = %s', x, y, dlaisnan );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+TODO
+```
+
+#### TODO
+
+TODO.
+
+```c
+TODO
+```
+
+TODO
+
+```c
+TODO
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+TODO
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[lapack]: https://www.netlib.org/lapack/explore-html/
+
+[lapack-dlaisnan]: https://www.netlib.org/lapack/explore-html/d3/d22/group__laisnan_gad49d1fe3d6890e9c4f60e0429abab3c9.html
+
+</section>
+
+<!-- /.links -->
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
new file mode 100644
index 000000000000..139e57cbce9e
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
@@ -0,0 +1,56 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var pkg = require( './../package.json' ).name;
+var dlaisnan = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var len;
+	var x;
+	var y;
+	var z;
+	var i;
+
+	len = 100;
+	x = uniform( len, -50, 50 );
+	y = uniform( len, -50, 50 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		z = dlaisnan( x[ i % len ], y[ i % len ] );
+		if ( isnan( z ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( z ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
new file mode 100644
index 000000000000..1439c27f77f5
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
@@ -0,0 +1,29 @@
+
+{{alias}}( DIN1, DIN2 )
+    Tests whether two double-precision floating-point arguments are unequal
+    and thus at least one is NaN.
+
+    Parameters
+    ----------
+    DIN1: number
+        First number to compare.
+
+    DIN2: number
+        Second number to compare.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating whether the arguments are unequal.
+
+    Examples
+    --------
+    > var bool = {{alias}}( NaN, NaN )
+    true
+    > bool = {{alias}}( NaN, 5.0 )
+    true
+    > bool = {{alias}}( 5.0, 5.0 )
+    false
+
+    See Also
+    --------
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
new file mode 100644
index 000000000000..37e6ce02c48b
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
@@ -0,0 +1,41 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+*
+* @param DIN1 - first number to compare
+* @param DIN2 - second number to compare
+* @returns boolean indicating whether the arguments are unequal
+*
+* @example
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+declare function dlaisnan( DIN1: number, DIN2: number ): boolean;
+
+
+// EXPORTS //
+
+export = dlaisnan;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
new file mode 100644
index 000000000000..cd6aeeaf8a13
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
@@ -0,0 +1,56 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import dlaisnan = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+	dlaisnan( 8, 2 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided values other than two numbers...
+{
+	dlaisnan( true, 3 ); // $ExpectError
+	dlaisnan( false, 2 ); // $ExpectError
+	dlaisnan( '5', 1 ); // $ExpectError
+	dlaisnan( [], 1 ); // $ExpectError
+	dlaisnan( {}, 2 ); // $ExpectError
+	dlaisnan( ( x: number ): number => x, 2 ); // $ExpectError
+
+	dlaisnan( 9, true ); // $ExpectError
+	dlaisnan( 9, false ); // $ExpectError
+	dlaisnan( 5, '5' ); // $ExpectError
+	dlaisnan( 8, [] ); // $ExpectError
+	dlaisnan( 9, {} ); // $ExpectError
+	dlaisnan( 8, ( x: number ): number => x ); // $ExpectError
+
+	dlaisnan( [], true ); // $ExpectError
+	dlaisnan( {}, false ); // $ExpectError
+	dlaisnan( false, '5' ); // $ExpectError
+	dlaisnan( {}, [] ); // $ExpectError
+	dlaisnan( '5', ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+	dlaisnan(); // $ExpectError
+	dlaisnan( 3 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
new file mode 100644
index 000000000000..c3a8f779cb97
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
@@ -0,0 +1,31 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var dlaisnan = require( './../lib' );
+
+var opts = {
+	'dtype': 'float64'
+};
+var x = discreteUniform( 100, -50, 50, opts );
+var y = discreteUniform( 100, -50, 50, opts );
+
+logEachMap( 'dlaisnan( %d, %d ) = %s', x, y, dlaisnan );
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
new file mode 100644
index 000000000000..b1c3e7475eb7
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+*
+* @module @stdlib/lapack/base/dlaisnan
+*
+* @example
+* var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+*
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
new file mode 100644
index 000000000000..c769bf0e928b
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
@@ -0,0 +1,53 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MAIN //
+
+/**
+* Tests whether two double-precision floating-point arguments are unequal and thus at least one is NaN.
+*
+* ## Notes
+*
+* -   This routine exists solely to avoid over-optimization in DISNAN.
+*
+* @param {number} DIN1 - first number to compare
+* @param {number} DIN2 - second number to compare
+* @returns {boolean} boolean indicating whether the arguments are unequal
+*
+* @example
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+function dlaisnan( DIN1, DIN2 ) {
+	return ( DIN1 !== DIN2 );
+}
+
+
+// EXPORTS //
+
+module.exports = dlaisnan;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
new file mode 100644
index 000000000000..a68cc4f91474
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
@@ -0,0 +1,69 @@
+{
+  "name": "@stdlib/lapack/base/dlaisnan",
+  "version": "0.0.0",
+  "description": "LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "stdmath",
+    "mathematics",
+    "math",
+    "lapack",
+    "dlaisnan",
+    "nan",
+    "isnan",
+    "test",
+    "inequality",
+    "linear",
+    "algebra",
+    "subroutines",
+    "float64",
+    "double",
+    "float64array"
+  ]
+}
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
new file mode 100644
index 000000000000..9bab475e82d0
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
@@ -0,0 +1,112 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var PINF = require( '@stdlib/constants/float64/pinf' );
+var NINF = require( '@stdlib/constants/float64/ninf' );
+var dlaisnan = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof dlaisnan, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 2', function test( t ) {
+	t.strictEqual( dlaisnan.length, 2, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `true` when either argument is NaN', function test( t ) {
+	var bool;
+
+	bool = dlaisnan( NaN, NaN );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( NaN, 5.0 );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( 5.0, NaN );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( NaN, 0.0 );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( 0.0, NaN );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( NaN, PINF );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( NINF, NaN );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns `false` when both arguments are equal non-NaN values', function test( t ) {
+	var bool;
+
+	bool = dlaisnan( 5.0, 5.0 );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( 0.0, 0.0 );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( -0.0, -0.0 );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( -0.0, 0.0 );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( PINF, PINF );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( NINF, NINF );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	bool = dlaisnan( -3.14, -3.14 );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns `true` when both arguments are unequal non-NaN values', function test( t ) {
+	var bool;
+
+	bool = dlaisnan( 1.0, 2.0 );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( -1.0, 1.0 );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( PINF, NINF );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	bool = dlaisnan( 0.0, 1.0 );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	t.end();
+});

From 4f70f76a6dae6d266c79057d1fecca0402b6e84e Mon Sep 17 00:00:00 2001
From: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>
Date: Sun, 17 May 2026 19:09:37 +0000
Subject: [PATCH 2/5] chore: update copyright years

---
 lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md         | 2 +-
 .../@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js         | 2 +-
 .../@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts          | 2 +-
 .../@stdlib/lapack/base/dlaisnan/docs/types/test.ts             | 2 +-
 lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js | 2 +-
 lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js      | 2 +-
 lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js       | 2 +-
 lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js      | 2 +-
 8 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
index 393748872f67..7cfc45537702 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
@@ -2,7 +2,7 @@
 
 @license Apache-2.0
 
-Copyright (c) 2025 The Stdlib Authors.
+Copyright (c) 2026 The Stdlib Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
index 139e57cbce9e..bb1b9da587ef 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
index 37e6ce02c48b..6467c096498c 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
@@ -1,7 +1,7 @@
 /*
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
index cd6aeeaf8a13..8115794c5bfa 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
@@ -1,7 +1,7 @@
 /*
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
index c3a8f779cb97..92e8b0037ed0 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
index b1c3e7475eb7..07197a771143 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
index c769bf0e928b..48fd6c7ccd20 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
index 9bab475e82d0..08c9d58bbf96 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2025 The Stdlib Authors.
+* Copyright (c) 2026 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.

From 9e4bf55db67bc86212f3fb71d8606d67dd1cf3b5 Mon Sep 17 00:00:00 2001
From: iampratik13 <bhagwatpratik781@gmail.com>
Date: Tue, 19 May 2026 19:44:55 +0530
Subject: [PATCH 3/5] chore: suggested changes

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: passed
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: passed
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: passed
  - task: lint_license_headers
    status: passed
---
---
 .../@stdlib/lapack/base/dlaisnan/README.md    | 16 ++++++-----
 .../base/dlaisnan/benchmark/benchmark.js      | 10 +++----
 .../lapack/base/dlaisnan/docs/repl.txt        |  8 +++---
 .../base/dlaisnan/docs/types/index.d.ts       |  4 +--
 .../@stdlib/lapack/base/dlaisnan/lib/main.js  |  8 +++---
 .../@stdlib/lapack/base/dlaisnan/test/test.js | 27 +++++++++++++++++++
 6 files changed, 51 insertions(+), 22 deletions(-)

diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
index 7cfc45537702..a32875fbc032 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
@@ -32,7 +32,7 @@ var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
 
 #### dlaisnan( DIN1, DIN2 )
 
-Tests whether two double-precision floating-point arguments are unequal and thus at least one is NaN.
+Tests input for NaN by comparing two double-precision floating-point arguments for inequality.
 
 ```javascript
 var bool = dlaisnan( NaN, NaN );
@@ -47,8 +47,8 @@ bool = dlaisnan( 5.0, 5.0 );
 
 The function has the following parameters:
 
--   **DIN1**: first number to compare.
--   **DIN2**: second number to compare.
+-   **DIN1**: first input number.
+-   **DIN2**: second input number.
 
 </section>
 
@@ -58,10 +58,10 @@ The function has the following parameters:
 
 ## Notes
 
--   `dlaisnan()` corresponds to the [LAPACK][LAPACK] auxiliary routine [`dlaisnan`][lapack-dlaisnan].
--   This routine is not for general use. It exists solely to avoid over-optimization in `disnan`.
--   `dlaisnan` checks for NaNs by comparing its two arguments for inequality. `NaN` is the only floating-point value where `NaN != NaN` returns `true`. To check for NaNs, pass the same variable as both arguments (i.e., `dlaisnan( x, x )`).
--   The function returns `true` whenever the two arguments are unequal, not only when one is NaN. This matches the Fortran reference implementation which simply returns `DIN1.NE.DIN2`.
+-   `dlaisnan()` corresponds to the [LAPACK][lapack] auxiliary routine [`dlaisnan`][lapack-dlaisnan].
+-   This routine is not for general use. It exists solely to avoid over-optimization in [`disnan`][lapack-disnan].
+-   `dlaisnan` checks for NaNs by comparing its two arguments for inequality. `NaN` is the only floating-point value where `NaN !== NaN` returns `true`. To check for NaNs, pass the same variable as both arguments (i.e., `dlaisnan( x, x )`).
+-   The function returns `true` whenever the two arguments are unequal, not only when one is `NaN`. This matches the Fortran reference implementation which simply returns `DIN1.NE.DIN2`.
 
 </section>
 
@@ -177,6 +177,8 @@ TODO
 
 [lapack-dlaisnan]: https://www.netlib.org/lapack/explore-html/d3/d22/group__laisnan_gad49d1fe3d6890e9c4f60e0429abab3c9.html
 
+[lapack-disnan]: https://www.netlib.org/lapack/explore-html/d0/d4c/group__isnan_ga7aa3164d5df8d883754b0a70e9c7209c.html
+
 </section>
 
 <!-- /.links -->
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
index bb1b9da587ef..5e2eb4b29344 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
@@ -21,8 +21,8 @@
 // MODULES //
 
 var bench = require( '@stdlib/bench' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var uniform = require( '@stdlib/random/array/uniform' );
+var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
 var pkg = require( './../package.json' ).name;
 var dlaisnan = require( './../lib' );
 
@@ -43,13 +43,13 @@ bench( pkg, function benchmark( b ) {
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
 		z = dlaisnan( x[ i % len ], y[ i % len ] );
-		if ( isnan( z ) ) {
-			b.fail( 'should not return NaN' );
+		if ( typeof z !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
 		}
 	}
 	b.toc();
-	if ( isnan( z ) ) {
-		b.fail( 'should not return NaN' );
+	if ( !isBoolean( z ) ) {
+		b.fail( 'should return a boolean' );
 	}
 	b.pass( 'benchmark finished' );
 	b.end();
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
index 1439c27f77f5..5553849e3739 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
@@ -1,15 +1,15 @@
 
 {{alias}}( DIN1, DIN2 )
-    Tests whether two double-precision floating-point arguments are unequal
-    and thus at least one is NaN.
+    Tests input for NaN by comparing two double-precision floating-point
+    arguments for inequality.
 
     Parameters
     ----------
     DIN1: number
-        First number to compare.
+        First input number.
 
     DIN2: number
-        Second number to compare.
+        Second input number.
 
     Returns
     -------
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
index 6467c096498c..def43c8a45da 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
@@ -21,8 +21,8 @@
 /**
 * LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
 *
-* @param DIN1 - first number to compare
-* @param DIN2 - second number to compare
+* @param DIN1 - first input number
+* @param DIN2 - second input number
 * @returns boolean indicating whether the arguments are unequal
 *
 * @example
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
index 48fd6c7ccd20..6ecbad7ad343 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
@@ -21,14 +21,14 @@
 // MAIN //
 
 /**
-* Tests whether two double-precision floating-point arguments are unequal and thus at least one is NaN.
+* Tests input for NaN by comparing two double-precision floating-point arguments for inequality.
 *
 * ## Notes
 *
-* -   This routine exists solely to avoid over-optimization in DISNAN.
+* -   This routine exists solely to avoid over-optimization in `disnan`.
 *
-* @param {number} DIN1 - first number to compare
-* @param {number} DIN2 - second number to compare
+* @param {number} DIN1 - first input number
+* @param {number} DIN2 - second input number
 * @returns {boolean} boolean indicating whether the arguments are unequal
 *
 * @example
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
index 08c9d58bbf96..d63c400ae447 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
@@ -110,3 +110,30 @@ tape( 'the function returns `true` when both arguments are unequal non-NaN value
 
 	t.end();
 });
+
+tape( 'the function returns expected values when passed the same variable as both arguments', function test( t ) {
+	var bool;
+	var x;
+
+	x = NaN;
+	bool = dlaisnan( x, x );
+	t.strictEqual( bool, true, 'returns expected value' );
+
+	x = 5.0;
+	bool = dlaisnan( x, x );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	x = 0.0;
+	bool = dlaisnan( x, x );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	x = -0.0;
+	bool = dlaisnan( x, x );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	x = PINF;
+	bool = dlaisnan( x, x );
+	t.strictEqual( bool, false, 'returns expected value' );
+
+	t.end();
+});

From f579524cb908190f402766573ddf8a2519d00a06 Mon Sep 17 00:00:00 2001
From: Karan Anand <anandkarancompsci@gmail.com>
Date: Wed, 20 May 2026 07:39:06 -0700
Subject: [PATCH 4/5] chore: remove redundant keyword

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown_pkg_readmes
    status: na
  - task: lint_markdown_docs
    status: na
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: passed
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---
---
 lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
index a68cc4f91474..bec346c5109f 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
@@ -63,7 +63,6 @@
     "algebra",
     "subroutines",
     "float64",
-    "double",
-    "float64array"
+    "double"
   ]
 }

From 8fac49a1047357368e30c85f7c5b36fc5cafe1a5 Mon Sep 17 00:00:00 2001
From: Karan Anand <anandkarancompsci@gmail.com>
Date: Wed, 20 May 2026 07:49:07 -0700
Subject: [PATCH 5/5] docs: keep consistent examples across files

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown_pkg_readmes
    status: na
  - task: lint_markdown_docs
    status: na
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: passed
  - task: lint_license_headers
    status: passed
---
---
 .../@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts        | 4 ++++
 lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js    | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
index def43c8a45da..a42bafe5bfe6 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
@@ -30,6 +30,10 @@
 * // returns true
 *
 * @example
+* var bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
+* @example
 * var bool = dlaisnan( 5.0, 5.0 );
 * // returns false
 */
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
index 07197a771143..ba21fca5cdb5 100644
--- a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
@@ -29,6 +29,9 @@
 * var bool = dlaisnan( NaN, NaN );
 * // returns true
 *
+* bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
 * bool = dlaisnan( 5.0, 5.0 );
 * // returns false
 */