sub foo($x, Pair ?$y, +$z){...}
If yes, what does this parse as:
foo(10, z => 5);If z => 5 is bound to $y, then $y is almost mandatory. ('almost' because we can still say foo(10); ). (and then can we also say foo(10, z => 5, z => 6)? :) That at least has the feature that it can be used to write bizarre code like C< sing :e:i:e:i:o > )
If it is bound to $z instead, how do we bind anything to $y positionally? Might as well change that to +$y.
It seems to me that an optional Pair is a catastrophe waiting to happen, and maybe it should just be illegal (or produce a warning at least)
Sorry if this has been gone over before...
--abhijit
