Sorting integers, floats and strings are surely some of the most widely used ways of sorting? You have some table-like thing, you want to sort it by some numeric column or alphabetically by some string column. Sorting some generic structure is surely the edge case, and even when you do that, surely the most common case is to compare one or two structure fields which are either ints, floats or strings.

In languages which try to be efficient, surely an expensive compare function is the outlier.