[issue20023] _csv.Dialect() does not check type for delimiter, escapechar and quotechar fields

[Vajrasky Kok]

Vajrasky Kok added the comment:

Bear in the mind, the bug is only reproducible with debug flag (--with-pydebug).

Victor, we have a more complete solution for this problem in #18829.

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nosy: +vajrasky

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<http://bugs.python.org/issue20023>
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