>   Rewrote the docs; it is now mixed; closed bug #20292.

You are probably wrong in modifying the return type to be mixed.
The function returns true/false in every case as I can see, and
if the two parameters were given it "returns" the values *in*
those variables, and still returns true/false. If it returned true,
than the content of those variables can be examined, otherwise
they are probably useless. So the return type is boolean...

Goba



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