refactor: address pr 716 feedback

[pavelnikolov]

No description provided.

[Copilot]

Pull request overview

This PR refines numeric input coercion to ensure GraphQL Float arguments and nullable float inputs correctly accept int64 values (commonly produced by large integer literals/variables), and expands regression coverage around that behavior.

Changes:

• Allow NullFloat.UnmarshalGraphQL to coerce int64 inputs to float64.
• Extend the internal input packer to coerce int64 into float64 when the target type is float64.
• Expand issue/regression tests to cover int32/int64 behavior for a custom Int64 scalar and for Float arguments (including large positive/negative values).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
nullable_types.go	Adds int64 handling to NullFloat GraphQL unmarshalling.
nullable_types_test.go	Adds a test case ensuring NullFloat accepts int64 input.
issue_305_test.go	Broadens regression coverage for integer-literal/variable coercion, including large values and Float args.
internal/exec/packer/packer.go	Adds int64 -> float64 coercion in UnmarshalInput for reflect.Float64.

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