in Sources/DistributedActors/ActorAddress.swift [450:455]
func isValidASCII(_ scalar: Unicode.Scalar) -> Bool {
(scalar >= ValidActorPathSymbols.a && scalar <= ValidActorPathSymbols.z) ||
(scalar >= ValidActorPathSymbols.A && scalar <= ValidActorPathSymbols.Z) ||
(scalar >= ValidActorPathSymbols.zero && scalar <= ValidActorPathSymbols.nine) ||
ValidActorPathSymbols.extraSymbols.contains(scalar)
}