[issue18373] implement sys.get/setbyteswarningflag()

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > I don't know why your patch is putting this in the thread state,
> > though...
> 
> If you have multiple threads one thread might want exceptions when
> str(bytes), and the other might not.

That sounds too much of a special case to me. You can still catch
BytesWarnings inside a context manager or something.

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