[issue30977] reduce uuid.UUID() memory footprint

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

This change breaks pickle.

You should preserve forward and backward pickle compatibility.

1. Pickle data produced by old Python versions should be unpickleable with a new implementation. Implement __setstate__ for satisfying this.

2. Pickle data produced by a new implementation should be unpickleable in old Python versions. There are many ways to satisfy this, you should choose the most efficient.

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components: +Library (Lib)
nosy: +serhiy.storchaka
type:  -> resource usage
versions: +Python 3.7

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