The fine manual says:
If the parameter does not exist at all, then param() will return undef in a scalar context, and the empty list in a list context.
Essentially using the reasoning mentioned by pc88mxer.
So this is a case of FAD (Functions as documented).
++ for identifying and documenting the issue clearly.
"A fanatic is one who redoubles his effort when he has forgotten his aim."—George Santayana
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