References: google.golang.org/protobuf/internal/genid.FieldOptions_OptionRetention_enum

const google.golang.org/protobuf/internal/genid.FieldOptions_OptionRetention_enum_fullname

one use

	google.golang.org/protobuf/internal/genid (current package)
		descriptor_gen.go#L722: 	FieldOptions_OptionRetention_enum_fullname = "google.protobuf.FieldOptions.OptionRetention"

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