slightly off topic, but it's always seemed weird to me that there is no english word for "don't care", it's a really awkward phrasing. - In boolean logic, we have true, false, and then no word for when it can be either.
Digital electronics has 0, 1 and x.
Java/C# have Boolean/bool?, with values true, false, and null.
English has apathetic, neutral, unbiased, nonpartisan.
"Ignored" perhaps?