Pitch: Character and String properties

Evolution Pitches
10

That sounds reasonable, but I wonder if it would be better to have something like:

extension Character {
  /// If this Character is ASCII, return the ASCII values that comprise it, 
  /// otherwise returns nil.
  ///
  /// For most ASCII Characters, there is only one value that comprises the 
  /// grapheme, returned in the first value of the result. The second value is 0.
  ///
  /// For "\r\n" (CR-LF), which is a single Character, this returns (0x0d, 0x0a)
  ///
  var asciiValue: (UInt8, UInt8)? { 
    ... 
  }
}

Or perhaps we have asciiValue return a single value, and also have some query for the CR-LF corner case. WDYT?