subtype_dealloc():  Simplified overly contorted retracking logic.  With this change, I think subtype_dealloc is actually a smidgen less obscure than it was in 2.3 -- we got rid of a negation in an "if" <wink>.
subtype_dealloc():  Simplified overly contorted retracking logic.  With
this change, I think subtype_dealloc is actually a smidgen less obscure
than it was in 2.3 -- we got rid of a negation in an "if" <wink>.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator