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Our goal is not only maximize performance. Andtextwrap.indent() is not performance critical for most applications as far as I know.

In#107374, I made the code slightly simpler by removing generator.
On the other hand, this change makes maintenance cost little higher. We need to review and test the case forpredicate is passed.
That's why I didn't incude this change in my PR.

(caching .append calls do not seem to help however).

Yes. It is old technique. Recent Python has little method call overhead. Soappend = L.append before loop has only little venefit.