Groovy truth and casting to boolean

Hi,

One of the next things I will look into with invokedynamic is surely the 
casting too boolean using invokedynamic.But I have the feeling something 
is off here.

If we have an expression

if (foo) m()

then m() will be called if foo can be converted to boolean true, also 
known as Groovy Truth(ness). From a runtime perspective the rules are 
easy, just expand it to foo.asBoolean(). But that is not how we compile 
this. Instead if we know the type of foo and it satisfies certain 
conditions we shortcut.

* foo static type is boolean => do nothing
* foo static type is other primitive => convert directly in bytecode.
* foo runtime value is null => false
* other cases call asBoolean()

This means we can replace the asBoolean method on everything except null 
and primitives. We do this mostly for efficiency reasons. Of and there 
is the specialty that asType(Boolean) falls back to asBoolean basically. 
Which makes sense, though a cleaner solution would probably have been to 
always use asType... of course more complicated performance wise as 
well.. possibly.

My question is though if we want to keep this mixed cases. Alternatives 
would be:

* always use asBoolean
* exempt asBoolean from replacement in meta classes



bye Jochen