What is the best approach for serializing BigDecimal/BigInteger to ProtocolBuffers

I am starting to migrate a custom serialization mechanism to Protocol Buffers. One data type that will be used particularly regularly is `BigDecimal`. Does anyone know of a good way of serializing this within Protocol Buffers? Our current serialization routine uses `BigDecimal.toPlainString()` for serialization, and `new BigDecimal(String)` for deserialization - I'm assuming there's a better way. My guess is to define a `BigDecimal` as: message BDecimal { required int32 scale = 1; required BInteger int_val = 2; } But I am not too sure how to define `BigInteger` - perhaps using its `toByteArray()` method?

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