[issue28665] Harmonize STORE_DEREF with STORE_FAST and LOAD_DEREF

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM. This saves function call and INCREF/DECREF pair.

What about DELETE_DEREF? PyCell_Set() also is used in unicode_concatenate().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28665>
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