Scala RichString is not Comparable to String

A sadness:

val r: scala.runtime.RichString = "1"
val s: String = "1"

if (r == s) {
  println("ok1")
} else {
  println("sad1")
}

if (s == r) {
  println("ok2")
} else {
  println("sad2")
}

if (s.equals(r)) {
  println("ok3")
} else {
  println("sad3")
}

if (r.equals(s)) {
  println("ok4")
} else {
  println("sad4")
}

Will print:

sad1
sad2
sad3
sad4

This isn’t as sad as:

sad1
ok2
sad3
ok4

which would precipitate Robey’s “ultimate sadness”.

I got into this state by adding a .drop to a String, and chaos resulted. The details are tangentially described here.

Still, this is another thing to keep in your head when coding along. I suppose it’s best to coerce RichStrings back to Strings immediately, so as not to allow RichStrings to propagate too far.