true - null; // expect runtime error
true - true; // expect runtime error
true - "s"; // expect runtime error
true - 123; // expect runtime error

null - null; // expect runtime error
null - true; // expect runtime error
null - "s"; // expect runtime error
null - 123; // expect runtime error

123 - null; // expect runtime error
123 - true; // expect runtime error
123 - "s"; // expect runtime error

"s" - null; // expect runtime error
"s" - true; // expect runtime error
"s" - 123; // expect runtime error