Just for the sake of completeness, we get to five if you count R, which allows one to intersperse positional and named parameters in a remarkably laissez-faire manner. It's not exactly a general-purpose language, though.

In reply to Re^9: When every microsecond counts: Parsing subroutine parameters by tfrayner
in thread When every microsecond counts: Parsing subroutine parameters by snowhare

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