Add JSON Marshal/Unmarshal to setof - #443

textappend: TextAppenderBinType -> TextAppender (as bin)

binappend: ErrorBinaryAppenderType -> BinaryAppender

binappend: BinaryAppenderType -> BinaryAppender

binmarshal: ErrorTestType -> BinaryMarshaler

textmarshal: TextStringTestType -> TextMarshaler (as string)

textmarshal: TextBinTestType -> TextMarshaler (as bin)

binmarshal: BinaryTestType -> BinaryMarshaler

TextAppenderBinValue: Value: ignored

BinaryAppenderValue: Value: ignored

TestAppendTextString: Value: ignored

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