code: protected final JDeserializerType getKeyDeserializerFromType( JType type ) throws UnsupportedTypeException, UnableToCompleteException {
          return getKeyDeserializerFromType( type, false, false );
      }
docs: Build the {@link JDeserializerType} that instantiate a {@link KeyDeserializer} for the given type.
  
  @param type type
  @return the {@link JDeserializerType}.
  @throws com.github.nmorel.gwtjackson.rebind.exception.UnsupportedTypeException if any.