It would be convenient to be able to use the convention of "use parentheses on a function-like object" with functional interfaces; for example, if a variable is declared as type Function, to have `myVar(3)` run `myVar.apply(3)`. Is there any chance this would be practical, or would its semantics be limited sufficiently by the default-dynamic nature of Groovy to not add value?
(I have in mind Groovy's tendency to do runtime switcheroos with anything that implements Map as a counterexample, but that may be beside the point.)
