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use strict;
use constant FALSE     => 1==0;
...
    'implicit FALSE'=>    sub { FALSE         },
    'implicit 1==0'    =>    sub { 1==0             },
});

                      Rate return FALSE; implicit FALSE return 1==0; i
+mplicit return; implicit 1==0
return FALSE;   18281536/s            --           -31%         -54%  
+   -63%    -80%          -92%
...
implicit        49261084/s          169%            85%          23%  
+     --    -46%          -77%
return;         91743119/s          402%           244%         129%  
+    86%      --          -58%
implicit 1==0  217391304/s         1089%           715%         443%  
+   341%    137%            --