[issue40116] Regression in memory use of shared key dictionaries for "compact dicts"

[Mark Shannon]

Mark Shannon <m...@hotpy.org> added the comment:

Just to clarify.

class AlwaysShared:

   opt = DEFAULT

   def __init__(self, attr, optional=None):
       self.attr = attr
       if optional:
           self.opt = optional

class SometimesShared:

   opt = DEFAULT

   def __init__(self, attr, optional=None):
       if optional:
           self.opt = optional
       self.attr = attr

The class AlwaysShared always has shared keys, whereas the class 
SometimesShared is not shared if `optional` is True for first instantiation, 
but False for a later instantiation.

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<https://bugs.python.org/issue40116>
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