[issue44640] Typos in error messages of isinstance() & issubclass()

[Jack DeVries]

Jack DeVries <jdevries3133 at gmail.com> added the comment:

The current string is correct. The word "union" is actually an exception to the "a/an" rule. Here is more detail:

https://english.stackexchange.com/questions/266309/why-is-union-an-exception-to-the-a-an-rule

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nosy: +jack__d

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<https://bugs.python.org/issue44640>
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