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  1. or download this
    perl -MData::Dump=pp
@values=("true",undef);
...
(["true", undef], [1, 1])
([undef, "true"], [1, 1])
([undef, undef], ["", undef])
  2. or download this
    perl -MData::Dump=pp
@values=("true",undef);
...
(["true", undef], [1, 1])
([undef, "true"], [1, 1])
([undef, undef], ["", ""])