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First commit: Don't dupe concat() definition; inline _compose().
The
concatmethod can just directly reuse the free functiondefinition. (Also using string-joining was a bit overkill.)
Inlining
_composeinto__iter__(its sole user) seems easier tofollow than having it defined nearly 50 lines away).
Second commit: Minor doc cleanups.
Punctuation. Use "cycler" instead of "Cycler" or "cycle" in sentences
slightly more consistently. Remove parameter descriptions that add no
information ("the second Cycler"). Remove unnecessary whitespace.