even if identical.  Patch by Florent Xicluna (again).

Patch by Brian Curtin.

Patch by Florent Xicluna.

methods of bytes, bytearray and unicode objects by using a common
implementation based on stringlib's fast search.  Patch by Florent Xicluna.

crashes in debug builds, for certain long numeric strings
corresponding to subnormal values.

tree may be mutated when serialized.

This was originally suggested by Guido, discussed on the stdlib-sig mailing
list, and given the OK by Guido directly to me. What this change essentially
means is that Python has taken a policy of silencing warnings that are only
of interest to developers by default. This should prevent users from seeing
warnings which are triggered by an application being run against a new
interpreter before the app developer has a chance to update their code.

Closes issue #7319. Thanks to Antoine Pitrou, Ezio Melotti, and Brian Curtin
for helping with the issue.

r77400.

classes.  Patch by Florent Xicluna.