[issue27070] Add ability to freeze (seal) mutable objects

[ppperry]

ppperry added the comment:

Python is not the type of language in which one applies such memory micro-optimizations. In any case, if you really need to do this, use a custom class that subclasses `list` and overrides the modification methods to add a check.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27070>
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