code: @Deprecated
      public static StringBuffer convertIDNToUnicode(String src, int options)
              throws StringPrepParseException{
          return IDNA2003.convertIDNToUnicode(src, options);
      }
docs: IDNA2003: Convenience function that implements the IDNToUnicode operation as defined in the IDNA RFC.
  This operation is done on complete domain names, e.g: "www.example.com".
  
  <b>Note:</b> IDNA RFC specifies that a conformant application should divide a domain name
  into separate labels, decide whether to apply allowUnassigned and useSTD3ASCIIRules on each,
  and then convert. This function does not offer that level of granularity. The options once
  set will apply to all labels in the domain name
  
  @param src       The input string to be processed
  @param options   A bit set of options:
  - IDNA.DEFAULT              Use default options, i.e., do not process unassigned code points
  and do not use STD3 ASCII rules
  If unassigned code points are found the operation fails with
  ParseException.
  
  - IDNA.ALLOW_UNASSIGNED     Unassigned values can be converted to ASCII for query operations
  If this option is set, the unassigned code points are in the input
  are treated as normal Unicode code points.
  
  - IDNA.USE_STD3_RULES       Use STD3 ASCII rules for host name syntax restrictions
  If this option is set and the input does not satisfy STD3 rules,
  the operation will fail with ParseException
  @return StringBuffer the converted String
  @deprecated ICU 55 Use UTS 46 instead via {@link #getUTS46Instance(int)}.
  @hide original deprecated declaration