public function push( string $key, $value ) : self {
		$this->offsetSet( $key, $value );
		return $this;
	}
public function push( string $key, $value ) : self {
		$this->offsetSet( $key, $value );
		return $this;
	}
public function push ( string $ key , $ value ) : self { $ this -> offsetSet ( $ key , $ value ) ; return $ this ; }
Push a configuration in via the key

@since 1.0.0

@param string $key Key to be assigned, which also becomes the property
@param mixed $value Value to be assigned to the parameter key
@return self
Push a configuration in via the key