[issue25341] File mode wb+ appears as rb+

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> But this behaviour treating wb+ and rb+ as the same is well tested and
seems to intended to do so.

I think this is not intended behavior. Tests just test that the current behavior is not changed accidentally. If I'm right, the patch LGTM. But since third-party code can depend on this behavior, I would fix it only in 3.6.

Tests were added in issue4362 and Barry asked the same question about "w+" (msg76134).

Barry, Benjamin, what are you think about this now?

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nosy: +barry, serhiy.storchaka

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