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Perl> undef == 10;
Use of uninitialized value in numeric eq (==) at (eval 2) line 3.
 
 
Perl> undef > 10;
Use of uninitialized value in numeric gt (>) at (eval 3) line 3.
 
 
Perl> undef < 10;
Warning: Use of "undef" without parentheses is ambiguous at (eval 4) line 3.
[!] compilation error: Unterminated <> operator at (eval 4) line 3.
 
Perl> (undef) < 10;
Use of uninitialized value in numeric lt (<) at (eval 5) line 3.
1
 
Perl> 10 == 10;
1
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