public function unless(bool $test, $encodings): self
    {
        return $this->when(true !== $test, $encodings);
    }
public function unless(bool $test, $encodings): self
    {
        return $this->when(true !== $test, $encodings);
    }
public function unless ( bool $ test , $ encodings ) : self { return $ this -> when ( true !== $ test , $ encodings ) ; }
Push encodings if the truth test does not evaluate to true.

@param bool $test
@param Encoding|string|iterable|\Closure|null $encodings
@return EncodingList
Push encodings if the truth test does not evaluate to true .