New submission from Марк Коренберг <socketp...@gmail.com>:

#39939 introduced .removeprefix for several classes. I propose adding 
kwargs-only parameter `, *, strict: bool = False`. It should raise some 
exception (I'm unuse what exactly) if the string DOES NOT start from specified 
prefix. False by default only for compatibility purposes. Personally I think it 
should be True, but I understand why it's impossible to change API.

The same about `removesuffix()`.

----------
components: Interpreter Core, Library (Lib)
messages: 396627
nosy: socketpair
priority: normal
severity: normal
status: open
title: str.removeprefix(): add strict: bool
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44521>
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