[issue43443] Should shelve support dict union?

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

One other thought.  While __ior__() could be used as a short-cut for update(), the related __or__() method is more problematic because it would need to create a new underlying DB.  So maybe this is a can worms that we should not open. It would be weird to have __ior__() but not __or__().

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<https://bugs.python.org/issue43443>
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