code: public AnyValueArray getAsNullableArray(String key) {
  		Object value = getAsObject(key);
  		return value != null ? AnyValueArray.fromValue(value) : null;
  	}
docs: Converts map element into an AnyValueArray or returns null if conversion is
  not possible.
  
  @param key a key of element to get.
  @return AnyValueArray value of the element or null if conversion is not
  supported.
  
  @see AnyValueArray
  @see AnyValueArray#fromValue(Object)