code: @Deprecated
      public static int decompose(char[] source,char[] target, boolean compat, int options) {
          return decompose(source, 0, source.length, target, 0, target.length, compat, options);
      }
docs: Decompose a string.
  The string will be decomposed to according to the specified mode.
  @param source The char array to decompose.
  @param target A char buffer to receive the normalized text.
  @param compat If true the char array will be decomposed according to NFKD
  rules and if false will be decomposed according to
  NFD rules.
  @return int   The total buffer size needed;if greater than length of
  result,the output was truncated.
  @param options The normalization options, ORed together (0 for no options).
  @exception IndexOutOfBoundsException if the target capacity is less than
  the required length
  @deprecated ICU 56 Use {@link Normalizer2} instead.
  @hide original deprecated declaration