code: public static <K,V> FnMapOf<K,V> of(final Type<K> keyType, final Type<V> valueType) {
          return new FnMapOf<K,V>(keyType, valueType);
      }
docs: <p>
  Specifies the type of the map components (key+value), so that the adequate map functions
  can be offered.
  </p>
  
  @param keyType the type of the map key components
  @param valueType the type of the map value components
  @return the adequate set function hub