default Ordering getOrdering() {
        // Defensively assume an unspecified order.
        return Ordering.UNSPECIFIED;
    }
Returns how the {@link Ordering} of mapped and un-mapped types relate
to each other.
<p>
Speedment is using this method to determine if certain optimizations of
streams can be made. Make sure to implicitly specify the Ordering in any
custom TypeMapper to allow maximum execution speed.
<p>
Specifying {@link Ordering#UNSPECIFIED } prevents some optimizations so
if possible, write a TypeMapper that RETAINS ordering.

@return        the ordering

@see Ordering#RETAIN
@see Ordering#INVERT
@see Ordering#UNSPECIFIED
runtime-parent/runtime-typemapper/src/main/java/com/speedment/runtime/typemapper/TypeMapper.java