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

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

-10.  I agree with Serhiy.  Automatic type conversion is rarely a feature.  It leads to silent bugs when people pass the wrong things.  Be explicit.

We are intentionally not one of those everything is really a string languages like Perl or Javascript.

This core API behavior change is big enough to need a PEP and steering council approval.

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nosy: +gregory.p.smith

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