from enum google.protobuf.FieldOptions.CType
The option [ctype=CORD] may be applied to a non-repeated field of type "bytes". It indicates that in C++, the data should be stored in a Cord instead of a string. For very large strings, this may reduce memory fragmentation. It may also allow better performance when parsing from a Cord, or when parsing with aliasing enabled, as the parsed Cord may then alias the original buffer.
from enum value: CORD = 1;
from enum value: STRING = 0;
from enum value: STRING_PIECE = 2;
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