code: public StrBuilder appendAll(final Iterable<?> iterable) {
          if (iterable != null) {
              for (final Object o : iterable) {
                  append(o);
              }
          }
          return this;
      }
docs: Appends each item in an iterable to the builder without any separators.
  Appending a null iterable will have no effect.
  Each object is appended using {@link #append(Object)}.
  
  @param iterable  the iterable to append
  @return this, to enable chaining
  @since 2.3