django__django-15569

RegisterLookupMixin._unregister_lookup() should clear the lookup cache.

Verdict: the fix is stated in the issue (Tier A).

In current source code, in the _unregister_lookup method, ​https://github.com/django/django/blame/main/django/db/models/query_utils.py#L212, the cache is not cleared, which should be done, as it is done in register_lookup, ​https://github.com/django/django/blame/main/django/db/models/query_utils.py#L202.

The text states the fix: “In current source code, in the _unregister_lookup method, ​https://github.com/django/django/blame/main/django/db/models/query_utils.py#L212, the cache is not cleared, wh…”

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