[issue36582] collections.UserString encode method returns a string

[Daniel Fortunov]

Daniel Fortunov <pythonbugs at danielfortunov.com> added the comment:

PR submitted here:
https://github.com/python/cpython/pull/13138

Rather than adding three different tests for the different code paths I chose to collapse the three different code paths by surfacing the underlying str.encode() defaults in the method signature of UserString.encode(), taking it down to a one-line implementation.

@xtreak: Thanks for the super-helpful triage and failing test case!

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