ComparableSeq.scala

object ComparableSeq {
  implicit def seqToComparableSeq[A <: Comparable[A]](seq : Seq[A]) : ComparableSeq[A] = {
    new ComparableSeq(seq)
  }
}

class ComparableSeq[A <: Comparable[A]](seq : Seq[A]) extends Seq[A] with Ordered[Seq[A]] {
  def compare(lhs : Seq[A]) : Int = {
    if (seq.length > lhs.length) { 
      1
    } else if (seq.length < lhs.length) {
      -1
    } else {
      compareRecurse(seq.toList, lhs.toList)
    }
  }
  
  private def compareRecurse(rhs : List[A], lhs : List[A]) : Int = (rhs,lhs) match {
    case (Nil, Nil) => 0
    case (rHead :: rTail, lHead :: lTail) =>
      rHead compareTo lHead match {
        case 0 => compareRecurse(rTail,lTail)
        case i => i
      }
  }
}

gistfile2.txt

inferred type arguments [Byte] do not conform to method seqToComparableSeq's type parameter bounds [A <: java.lang.Comparable[A]]
[error]     case add : Ipv4Address => seqToComparableSeq(this.bytes).compare(add.bytes)
[error]                               ^
[error] one error found