[issue9566] Compilation warnings under x64 Windows

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

haypo: please avoid introducing explicit casts (such as the one in pyexpat.c). Use SAFECASTs instead. If you are absolutely certain that a cast cannot possibly truncate, add a comment explaining why that is. In the specific case, I think it actually *is* possible that the cast truncates, because the case that read() returned too many bytes is incorrectly handled (it should set len to -1).

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<http://bugs.python.org/issue9566>
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