[issue29336] merge tuples in module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Following patch uses _PyCode_ConstantKey() as a key. This allows supporting integers, floats, bytes, etc.

But I think we can go further and merge constants recursively.

See also issue28813.

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nosy: +rhettinger
Added file: http://bugs.python.org/file46371/merge-constants.patch

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