@Override
    default long hash(T object) {
        final E e = apply(object);
        return e == null ? -1 : e.hashCode();
    }
Returns an alternative expression that represents the {@link Enum#name()}
of the enum that would otherwise have been returned by this expression.
<p>
If this expression would have returned {@code null}, then the new
expression will also evaluate to {@code null}.

@return  the name expression
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/ToEnumNullable.java