V2: Fix wrapper extension JSON serialization #821
Merged
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A singular message field using one of the wrapper messages from google/protobuf/wrappers.proto uses the "unwrapped" value as the property type. For example,
google.protobuf.BoolValue field = 1
is generated asfield?: boolean
.The same principle applies to extension fields, but serialization to JSON and parsing from JSON for such an extension field is broken. This fixes the issue, and adds test coverage.