[issue1022] use bytes for code objects

[Brett Cannon]

Brett Cannon added the comment:

I have security/stability issues with code objects having mutable
bytecode.  This would allow someone to possibly crash the interpreter
with crappy bytecode.  I also have a worry that someone might come up
with some clever way of causing different code to execute through
manipulating what LOAD_GLOBALS or STORE_GLOBALS accesses/sets.

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nosy: +brett.cannon

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<http://bugs.python.org/issue1022>
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