("foo", "bar") < ("bar", "foo") < is true for second string
("bar", "foo") < ("foo", "bar") < is true for first string
We fix this by fully comparing one string, then trying the other one.
("foo", "bar") < ("bar", "foo") < is true for second string
("bar", "foo") < ("foo", "bar") < is true for first string
We fix this by fully comparing one string, then trying the other one.