[issue43535] Make str.join auto-convert inputs to strings.

[Jacob Nilsson]

Jacob Nilsson <jacob.nilsson at ltu.se> added the comment:

For what my opinion is worth, I agree with Grégory's suggestion because the ',' part of ','.join(...) is almost as unintuitive as the problems Raymond's suggestions are trying to fix.

I was going to suggest a builtin to work on both str and bytes, like join(sep=None, strtype=str, *strings) but that interface looks pretty bad...

I think joinstr/joinbytes according to Grégory's suggestion (perhaps as classmethods of str/bytes?) would make the most sense.

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nosy: +ajoino

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<https://bugs.python.org/issue43535>
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