(Re)set an extra attribute.
See http\Cookie::addExtra().
-> **Note:** The attribute will be removed from the extras list if $extra_value is NULL.
+> ***NOTE:***
+> The attribute will be removed from the extras list if $extra_value is NULL.
## Params:
## Returns:
* http\Cookie, self.
+
+## Throws:
+
+* http\Exception\InvalidArgumentException