in modules/core/src/main/scala/org/scalasteward/core/repoconfig/PullRequestFrequency.scala [57:64]
def fromString(s: String): Either[String, PullRequestFrequency] =
s.trim.toLowerCase match {
case Asap.render => Right(Asap)
case "@daily" => Right(Timespan(1.day))
case "@weekly" => Right(Timespan(7.day))
case "@monthly" => Right(Timespan(30.day))
case other => parseTimespan(other).orElse(parseCronExpr(other))
}