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bpo-26133: Fix typos (#5010)

* Fix typos
* Change warning text
* Add test
A
Andrew Svetlov committed
a8f4e15f3d33084862ddd3a7d58cd00034e94f16
Parent: e0aef4f
Committed by GitHub <noreply@github.com> on 12/26/2017, 9:53:38 AM