[swift-evolution] [Pitch] Unify joined(separator:) and flatten()

[Jacob Bandes-Storch]

In the swift-lang Slack channel, a few of us were discussing
joined(separator:) and realized that flatten() does almost exactly the same
thing.

Is there interest in renaming flatten() to joined()?  Since joined takes a
separator that's any Sequence, we can't have a default value for the
separator parameter, but we can have a variant of joined() with no
arguments.

Jacob
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