PEP 238 discusses how `1 / 2` differing from `1 / 2.0` can be confusing : http://t.co/lkTAIPcEEo . I wonder if Ruby will change similarly?
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Positional arguments work well, as do keyword arguments. I think it's a mistake to support both though.
In e.g. Python it's hard to control how people will call you, and you may have differing views on the API you're exposing.