getset_descr_set(): guard against deletion (indicated by a set call with a NULL value), in a somewhat lame way: call the set() function with one argument.  Should I add a 3rd function, 'del', instead?
getset_descr_set(): guard against deletion (indicated by a set call
with a NULL value), in a somewhat lame way: call the set() function
with one argument.  Should I add a 3rd function, 'del', instead?

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