[protobuf] move optional field into oneof

['Mircea Markus' via Protocol Buffers]

Hi,

The doc <https://developers.google.com/protocol-buffers/docs/proto#oneof>warns 
about moving optional fields into oneof: 'You may lose some of your 
information (some fields will be cleared) after the message is serialized 
and parsed'
I want to move an single optional field into an oneof, i.e. I'd like to 
evolve:

into:
message SampleMessage {
   oneof test_oneof {
     string name = 4;
     MyType new_field = 5;
  }
}

Will that wipe any existing values of name?

Thanks,
Mircea
 

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