[issue19219] speed up marshal.loads()

[STINNER Victor]

STINNER Victor added the comment:

"You should ensure that loaded bytes are ASCII-only. Otherwise broken or malicious marshalled data will compromise you program."

This is not new, see the red warning in marshal doc:

"""
Warning

The marshal module is not intended to be secure against erroneous or maliciously constructed data. Never unmarshal data received from an untrusted or unauthenticated source.
"""

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19219>
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