But did you try simply switching off warnings (in a suitably narrow scope, of course)? I.e.,
    no warnings;
or
    no warnings qw(numeric);

See warnings and perllexwarn.

In reply to Re^3: Argument "" Isn't numeric in numeric eq (==) by AnomalousMonk
in thread Argument "" Isn't numeric in numeric eq (==) by ler224

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