func google.golang.org/protobuf/encoding/protojson.isKnownValue
2 uses
google.golang.org/protobuf/encoding/protojson (current package)
decode.go#L209: if tok, _ := d.Peek(); tok.Kind() == json.Null && !isKnownValue(fd) && !isNullValue(fd) {
decode.go#L243: func isKnownValue(fd protoreflect.FieldDescriptor) bool {
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