code: public static String plus(CharSequence left, Object value) {
          return left + DefaultGroovyMethods.toString(value);
      }
docs: Appends the String representation of the given operand to this CharSequence.
  
  @param left  a CharSequence
  @param value any Object
  @return the original toString() of the CharSequence with the object appended
  @since 1.8.2