[issue3322] bugs in scanstring_str() and scanstring_unicode() of _json module

[Bob Ippolito]

Bob Ippolito <bob at redivi.com> added the comment:

I've audited the patch, while it does fix the input range it looks like
it regresses other things (at least the error messages). "begin" was
intentionally used. The patch is not suitable for use, I'll create a
minimal patch that just fixes input validation.

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<http://bugs.python.org/issue3322>
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