[issue33134] dataclasses: use function dispatch instead of multiple tests for adding __hash__

[Eric V. Smith]

Change by Eric V. Smith <eric at trueblade.com>:


----------
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33134>
_______________________________________