* @since 19.0 (since 1.0 as constant {@code SINGLE_WIDTH})
   */
  @Deprecated
  public static CharMatcher singleWidth() {
    return SingleWidth.INSTANCE;
  }

  // Static factories

  /** Returns a {@code char} matcher that matches only one specified BMP character. */
  public static CharMatcher is(char match) {
    return new Is(match);
  }

  /**

   * @since 19.0 (since 1.0 as constant {@code SINGLE_WIDTH})
   */
  @Deprecated
  public static CharMatcher singleWidth() {
    return SingleWidth.INSTANCE;
  }

  // Static factories

  /** Returns a {@code char} matcher that matches only one specified BMP character. */
  public static CharMatcher is(char match) {
    return new Is(match);
  }

  /**

   *    throw new BadException(badMsg(...));
   * }
   *
   * The alternative natural refactorings into void or Exception-returning methods are much slower.
   * This is a big deal - we're talking factors of 2-8 in microbenchmarks, not just 10-20%. (This is
   * a hotspot optimizer bug, which should be fixed, but that's a separate, big project).
   *

   *    throw new BadException(badMsg(...));
   * }
   *
   * The alternative natural refactorings into void or Exception-returning methods are much slower.
   * This is a big deal - we're talking factors of 2-8 in microbenchmarks, not just 10-20%. (This is
   * a hotspot optimizer bug, which should be fixed, but that's a separate, big project).
   *