[bug] Array#first(symbol) doesn't raise?

< ^ > P N |<>|^_>< --- | ~ ...Help

irb(main):001:0> %w(a b c).first(:xyz)
=> ["a", "b", "c"]
irb(main):002:0> %w(a b c).last(:xyz)
=> ["a", "b", "c"]

This seems inconsistent to me. I would expect a TypeError.

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Simon Strandgaard