public static <ENTITY, D> Collector<ENTITY, ?, Map<Float, List<ENTITY>>>
    groupingBy(FloatField<ENTITY, D> field) {
        return groupingBy(field, field.getter()::apply, HashMap::new, toList());
    }
A number of collectors specialized for entities. These are inspired by the
{@link java.util.stream.Collectors} class in the java standard libraries.

@author Emil Forslund
@since  3.0.2
runtime-parent/runtime-field/src/main/java/com/speedment/runtime/field/collector/FieldCollectors.java