Yury Selivanov added the comment: > Good sleuthing! So the bug is in _lru_cache?
I don't think it's a bug of lru_cache. It stores strong references for arguments and return value of the decorated function (which btw isn't documented). I don't think it's possible to write efficient generic lru_cache that would just use weakrefs. The problem is that because _tp_cache helper uses it, the lifetime of some typing classes becomes indefinite. Which shouldn't be a problem for a typical user of typing, since most of the time it is used on the module level. We have two potential solutions to this problem: 1. Add a weak-ref type cache and refactor _tp_cache to use it; 2. Cleanup lru-cache before/adter running each typing test. [1] is the ideal solution, [2] should work good enough. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28649> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
