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  1. or download this
    perl -E "use strict; use warnings; say( '' + 1 ); say( !1 + 1 ); say !
+1; say '!1 is defined' if defined !1"
Argument "" isn't numeric in addition (+) at -e line 1.
1
1

!1 is defined
  2. or download this
      DB<1> say ~~ (-1)
18446744073709551615