"%o" -% ""           == "!"
"%o" -% "a"          == "!"
"%o" -% "aa"         == "!"
"%o" -% " "          == "!"
"%o" -% "aaa"        == "!"
"%o" -% "a "         == "!"
"%o" -% " a"         == "!"
"%o" -% "b"          == "!"
"%o" -% "aaaa"       == "!"
"%o" -% "aa "        == "!"
"%o" -% "a a"        == "!"
"%o" -% "ab"         == "!"
"%o" -% 0            == "0"
"%o" -% 1            == "1"
"%o" -% (-1)         == "-1"
"%o" -% 2            == "2"
"%o" -% (-2)         == "-2"
"%o" -% 3            == "3"
"%o" -% (-3)         == "-3"
"%o" -% 4            == "4"
"%o" -% (-4)         == "-4"
"%o" -% 5            == "5"
"%o" -% (-5)         == "-5"
"%o" -% 6            == "6"
"%o" -% 0.0          == "0"
"%o" -% 1.0          == "1"
"%o" -% 0.5          == "0.4"
"%o" -% (-1.0)       == "-1"
"%o" -% 1.5          == "1.4"
"%o" -% 0.25         == "0.2"
"%o" -% Infinity     == "Infinity"
"%o" -% 2.0          == "2"
"%o" -% (-0.5)       == "-0.4"
"%o" -% 1.25         == "1.2"
"%o" -% 0.75         == "0.6"
"%o" -% (-Infinity)  == "-Infinity"
"%o" -% (0 % 1)      == "0"
"%o" -% (1 % 1)      == "1"
"%o" -% ((-1) % 1)   == "-1"
"%o" -% (1 % 2)      == "0.4"
"%o" -% (2 % 1)      == "2"
"%o" -% ((-1) % 2)   == "-0.4"
"%o" -% ((-2) % 1)   == "-2"
"%o" -% (1 % 3)      == "0"
"%o" -% (3 % 1)      == "3"
"%o" -% ((-1) % 3)   == "-0"
"%o" -% ((-3) % 1)   == "-3"
"%o" -% (1 % 4)      == "0.2"
"%o" -% 'a'          == "!"
"%o" -% ' '          == "!"
"%o" -% 'b'          == "!"
"%o" -% 'A'          == "!"
"%o" -% 'c'          == "!"
"%o" -% '\n'         == "!"
"%o" -% 'd'          == "!"
"%o" -% '0'          == "!"
"%o" -% 'e'          == "!"
"%o" -% 'B'          == "!"
"%o" -% 'f'          == "!"
"%o" -% '!'          == "!"
"%o" -% False        == "!"
"%o" -% True         == "!"