Using suits.

  Golf is played by stacking cards of any color in sequence.  Does this mean
  the game doesn't keep track of suits during play?

If I'm understanding the instructions, card suit should be ignored.

A separate question is whether the card representation should ignore suit too.
In anticipation of expected future uses the game, it seems reasonable to
have a card represent suit and rank, but a great number of software-development
sins have resulted from anticipating requirements that never materialize (this
problem is the source of the "you ain't gonna need it" heuristic in extreme
programming).