src/Configuration/Option/Prefix.php
public function filter(OptionsInterface $options, $value)
    {
        if (is_callable($value)) {
            $value = call_user_func($value, $options);
        }

        if ($value instanceof ProcessorInterface) {
            return $value;
        }

        return new KeyPrefixProcessor((string) $value);
    }
public function filter(OptionsInterface $options, $value)
    {
        if (is_callable($value)) {
            $value = call_user_func($value, $options);
        }

        if ($value instanceof ProcessorInterface) {
            return $value;
        }

        return new KeyPrefixProcessor((string) $value);
    }
{@inheritdoc}