Thanks.
But it's strange:
open my $A, '>', 'out.txt';
print     $A - 1 == 0 ? "A\n" : "B\n"; # prints 'B' to STDOUT
print STDERR - 1 == 0 ? "A\n" : "B\n"; # prints 'B' to STDERR

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In reply to Re^4: map sentence with subtraction interpreted as with negative number by rsFalse
in thread map sentence with subtraction interpreted as with negative number by rsFalse

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