code: public CRestBuilder booleanFormat(String trueFormat, String falseFormat) {
          return property(CREST_BOOLEAN_TRUE, trueFormat).property(CREST_BOOLEAN_FALSE, falseFormat);
      }
docs: Overrides the default boolean format for serialization (default are "true" and "false").
  @param trueFormat format for TRUE
  @param falseFormat format for FALSE
  @return current builder
  @see CRestConfig#CREST_BOOLEAN_TRUE
  @see CRestConfig#CREST_BOOLEAN_FALSE
  @see CRestConfig#getBooleanTrue()
  @see CRestConfig#getBooleanFalse()