uri_escape($values->{$_})
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If the values are more than one, you get multiple parameters passed. It's this second parameter that's causing fits, and can be a security leak!

$values->{$_} is a scalar, as hash values can only be scalars. A scalar can be a reference, a number, a string or undef, but not multiple values without dereferencing. Or that's how I have always understood scalars. I don't think there's much point in explicitly putting a scalar in scalar context with the scalar operator.

Could you please give me, if possible, an example of a scalar that returns a two-element list?

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