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`separated` method added in Iterable extension
Fixes #342.
- [x] I’ve reviewed the contributor guide and applied the relevant portions to this PR.
@kevmoo can you please review this one?
I'd leave the review to @devoncarew and/or @lrhn
Closing as the dart-lang/collection repository is merged into the dart-lang/core monorepo. Please re-open this PR there!