code: public String getString(String name) throws JSONException {
  		Object object = get(name);
  		String result = JSON.toString(object);
  		if (result == null) {
  			throw JSON.typeMismatch(name, object, "String");
  		}
  		return result;
  	}
docs: Returns the value mapped by {@code name} if it exists, coercing it if necessary.
  @param name the name of the property
  @return the value
  @throws JSONException if no such mapping exists.