print nil != nil; // expect: false

print true != true; // expect: false
print true != false; // expect: true

print 1 != 1; // expect: false
print 1 != 2; // expect: true

print "str" != "str"; // expect: false
print "str" != "ing"; // expect: true

print nil != false; // expect: true
print false != 0; // expect: true
print 0 != "0"; // expect: true