[issue19255] Don't "wipe" builtins at shutdown

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Perhaps we should special case shutdown of the builtins module. E.g.
> reset it to initial value (all initial members of the builtins module
> are immutable and can't create resource loops) instead wiping.

This sounds like a reasonable approach.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19255>
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