[issue20374] Failure to compile with readline-6.3-rc1

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> With your patch, _readline.so again builds correctly.

Yes, this is what I wanted to know. Sorry for the awkward formulation.

Type casting is dangerous because it may hide the signature mismatch, which 
can cause problems later in run time. It is better to rely on static type 
checking if possible.

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<http://bugs.python.org/issue20374>
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