# Copies a part of self starting at index `my_from` of length `length` into `other`, starting at `its_from`
fun copy_to(other: StringIndex, my_from: Int, its_from: Int, length: Int)`{
# Copies a part of self starting at index `my_from` of length `length` into `other`, starting at `its_from`
fun copy_to(other: StringIndex, my_from: Int, its_from: Int, length: Int)`{