+ - fix warnings about unknown attribute parameters on metaclass inflation
+ - don't pass 'handles' down when doing 'has +' to avoid unDWIMmy explosions
+ - throw a useful exception when typemap doesn't return a value
+ - avoid localising @_ when not required for Sub::Quote
- successfully inflate a metaclass for attributeless classes (RT#86415)
- fix false default values used with non-lazy accessors
- stop built values that fail isa checks still getting stored in the object