const google.golang.org/protobuf/encoding/protowire.FirstReservedNumber

2 uses

	google.golang.org/protobuf/encoding/protowire (current package)
		wire.go#L25: 	FirstReservedNumber Number = 19000
		wire.go#L36: 	return MinValidNumber <= n && n < FirstReservedNumber || LastReservedNumber < n && n <= MaxValidNumber

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