%method functions, dynamic function calls

[ChristianGruen]

With the #1817, the %method annotation was introduced for functions. It is interpreted by the lookup operator:

let $number := { 'value': -3, 'abs': %method fn() { abs($this?value) } }
return $number?abs()

I think we should extend this mechanism to dynamic function calls, as many people use the constructs interchangeably:

return $number('abs')()

I agree that the binding mechanism should not apply for map:get or any other map functions and iterations.

[michaelhkay]

My preference is to confine this to the lookup operator - primarily because that looks more like a method call in OO languages.