How do I check if two colours are equal and convert a colour to its string representation?

  primary <- #FF0000       red
  other <- #FF0000         same red
  accent <- #00FF00        green

  if primary == other          same colour
  if primary <> accent         different colour

  str <- $primary              converts to string representation

  ordering <- primary <=> accent  spaceship comparison
  brighter <- primary >? accent   coalescing for greater

defines module qa.operators.colourequality

  defines program

    ColourEqualityDemo()
      stdout <- Stdout()

      // === COLOUR LITERALS ===

      primary <- #FF0000
      other <- #FF0000
      accent <- #00FF00
      highlight <- #0000FF

      // === EQUALITY ===

      if primary == other
        stdout.println("Primary and other are the same colour")

      require primary == other
      require primary <> accent
      require accent <> highlight

      // === SPACESHIP ORDERING ===

      ordering <- primary <=> accent
      stdout.println(`Red <=> Green: ${ordering}`)

      // === STRING CONVERSION ===

      redStr <- $primary
      greenStr <- $accent
      stdout.println(`Red as string: ${redStr}`)
      stdout.println(`Green as string: ${greenStr}`)

      // === COALESCING ===

      lesser <- primary <? accent
      greater <- primary >? accent
      stdout.println(`Lesser colour: ${lesser}`)
      stdout.println(`Greater colour: ${greater}`)

      // === ISSET ===

      require primary?
      unsetColour <- Colour()
      require ~unsetColour?

      // === COPY ===

      copied <- Colour()
      copied :=: primary
      require copied == primary
      stdout.println(`Copied colour: ${copied}`)

if primary.equals(other)

if primary == other