Make the inject function of Unfold pure#3223
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Change Unfold's inject from (a -> m s) to (a -> s). Improves fusion, Stream.unfold no longer needs a PreInit state, eliminating one state constructor and one Skip on the first pull for unfolds with a pure inject. Also fixes a latent bug in Unfold.before where `action >> inject` resolved through the Reader (((->) a)) monad's >> and silently dropped the action.
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