[issue37141] Allow multiple separators in StreamReader.readuntil

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Would you make a PR?
I guess to modify Stream.readuntil() 
StreamReader is deprecated, I'm not sure if we should add new functionality to this class.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37141>
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