[docs] [issue35714] Document that the null character '\0' terminates a struct format spec

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

I'm not sure whether having NULLs terminate a struct format string is a feature or a bug.

Given that nearly every other string in Python treat NULLs as ordinary characters, I'm inclined to say this is a bug. Or at least an unnecessary restriction that ought to be lifted.

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nosy: +steven.daprano
type:  -> behavior

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