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And yet, if I hadn't specified, it would've been ambiguous.

Tangential, but this is why I still love Ruby's Enumerable module; it has `#select` and `#reject`, as well as the `#filter` method that people from other languages are used to.

Can you think of any reasonably popular language where a "filter" operation drops the element if the filtering expression evaluates to true?

No, I can’t. Why do you ask? My point was that it's much nicer to have method names that do what they say instead of the programmatic version of the word "biweekly."

Genuine curiosity whether an outlier exists in the "filter" === "include" area.

It's based on a real world filter, which actually is a separator. By that analogy anything that sticks to the filter is considered a waste