Don't see why, but it seems to be a problem of precedence. Try: 

my $workday = 0 if not $dow == 6 && not $dow == 7;

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The way forward always starts with a minimal test.

In reply to Re: Paranormal leakage of previous value from conditionally set lexical variable by 1nickt
in thread Paranormal leakage of previous value from conditionally set lexical variable by Anonymous Monk

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