Spring enum properties possible values

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RelaxedDataBinder#bind()
  RelaxedConversionService#convert()
    1. try DefaultConvertionService#convert()

       # only support `A_VALUE`
       StringToEnumConverterFactory#StringToEnum#convert()

    2. then GenericConversionService#convert()

       # the config key can be :
       # 0 = "a-value"
       # 1 = "a_value"
       # 2 = "aValue"
       # 3 = "avalue"
       # 4 = "A-VALUE"
       # 5 = "A_VALUE"
       # 6 = "AVALUE"
       RelaxedConversionService$StringToEnumIgnoringCaseConverterFactory$StringToEnum#convert()