[issue4718] wsgiref package totally broken

[Dmitry Vasiliev]

Dmitry Vasiliev <dima at hlabs.spb.ru> added the comment:

Antoine Pitrou wrote:
> Why do you say they were removed? I see code like "assert
> isinstance(value, bytes)".

Support and tests for mutable "bytearray" and "memoryview" was removed.
All subclasses of "bytes" must be immutable so isinstance() should be OK
here.

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