code: public boolean isDistriminateTokenLength(final TokenType tokenType) {
          final Boolean discriminateTokenLength = _discriminateTokenLength.get(tokenType);
          if (discriminateTokenLength == null) {
              return false;
          }
          return discriminateTokenLength.booleanValue();
      }
docs: Should tokens be discriminated (when matching) based on length. For
  example, if "hello" and "hi" should be matched, then length
  discrimination should be false. If only "hello" and "world", but not "hi"
  should be matched then length discrimination should be true.