code: @Deprecated
      public static String decompose(String str, boolean compat, int options) {
          return getDecomposeNormalizer2(compat, options).normalize(str);
      }
docs: Decompose a string.
  The string will be decomposed to according to the specified mode.
  @param str     The string to decompose.
  @param compat  If true the string will be decomposed according to NFKD
  rules and if false will be decomposed according to NFD
  rules.
  @param options The normalization options, ORed together (0 for no options).
  @return String The decomposed string
  @deprecated ICU 56 Use {@link Normalizer2} instead.
  @hide original deprecated declaration