Fix incorrect serializing of std::optional when value is not provided
#1362
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Closing this PR as the fix needs to go into 3.2 first. |
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resolves #1189 .
When serializing a
std::optionalfield, and a value is not provided for thestd::optional, we need to add into the serialization the flag specifying that a missing value is serialized. Prior to this PR, the flag was missing.