/**
 * Enables a comparison of arbitrary values with support for undefined/null.
 * Requires the `<` and `>` operators to return something reasonable for the provided values.
 */
export function compare<T>(x?: T, y?: T) {
  if (x == undefined && y == undefined) {
    return 0;
  } else if (x == undefined) {
    return -1;
  } else if (y == undefined) {
    return 1;
  } else if (x < y) {
    return -1;
  } else if (x > y) {
    return 1;
  } else {
    return 0;
  }
}