gh-91081: Add note on WeakKeyDictionary behavior when deleting a replaced entry (GH-91499)

(cherry picked from commit c615286e8576f2555d4380f38a966c300805b1a5)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
Co-authored-by: Pieter Eendebak <P.T.eendebak@tudelft.nl>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
1 file changed