const github.com/golang-migrate/migrate/v4/database.NilVersion

4 uses

	github.com/golang-migrate/migrate/v4/database (current package)
		driver.go#L19: const NilVersion int = -1

	github.com/golang-migrate/migrate/v4/database/postgres
		postgres.go#L286: 		return database.NilVersion, false, nil
		postgres.go#L291: 				return database.NilVersion, false, nil

	github.com/golang-migrate/migrate/v4
		migrate.go#L391: 	if v == database.NilVersion {

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