What do I call a method that's the dual of `map`, i.e. mapping over a *contravariant* type. (Is "dual" the right word here?!)
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@propensive shameless plug for @ScalazPerDiem https://twitter.com/ScalazPerDiem/status/536192172559589376 … :) cc@adelbertchangThis Tweet is unavailable. -
@FouriersTrick @ScalazPerDiem@adelbertchang I think I prefer `on`, actually... ;)
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