[issue27535] Ignored ResourceWarning warnings leak memory in warnings registries

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

Victor: "I consider that PR 4489 is a bugfix, so I proposed backports to Python 2.7 (PR 4588) and 3.6 (PR 4587)."

Serhiy: Are you ok to backport the change to stable branches?

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