[issue8651] "s#" and friends can silently truncate buffer length

[STINNER Victor]

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

> Reopen the issue if you would like a port to 2.7
> (I am too lazy to do it)

I backported the fix to help issue #11277. While backporting the fix, I found another bug fixed by 509f1c15a1e1.

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