Binding fails when attempting to bind to methods with whitespace in statement

[Jahnp]

In templates, it seems the compiler chokes when there's any whitespace in a binding statement that binds to a method. For example, whitespace in and between arguments fails:

<toggle-button js-bind="text:$owner.concatStrings('Hello ', 'World!')" />

As well as whitespace between binding statements:

<toggle-button js-bind="class:$owner.classString, text:$owner.concatStrings('Hello', 'World!')" />

But no whitespace seems fine:

<toggle-button js-bind="class:$owner.classString,text:$owner.concatStrings('Hello','World!')" />