[issue44194] Folding ''.join(<known number of elts>) into f-strings

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

> It is a pretty-targeted optimization, so I don't expect it to speed up the macro benchmarks. Though that shouldn't be a blocker for small, targeted optimizations.

In the past we've rejected optimizations that make the code more complex and don't result in any noticeable real-world speedups. I don't think that policy has changed.

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