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BadRequestException example

    public function get(string $key, mixed $default = null): string|int|float|bool|null
    {
        if (null !== $default && !\is_scalar($default) && !$default instanceof \Stringable) {
            throw new \InvalidArgumentException(sprintf('Expected a scalar value as a 2nd argument to "%s()", "%s" given.', __METHOD__, get_debug_type($default)));
        }

        $value = parent::get($key, $this);

        if (null !== $value && $this !== $value && !\is_scalar($value) && !$value instanceof \Stringable) {
            throw new BadRequestException(sprintf('Input value "%s" contains a non-scalar value.', $key));
        }

        return $this === $value ? $default : $value;
    }

    /** * Replaces the current input values by a new set. */
    public function replace(array $inputs = []): void
    {
        $this->parameters = [];

    public function all(string $key = null): array
    {
        if (null === $key) {
            return $this->parameters;
        }

        if (!\is_array($value = $this->parameters[$key] ?? [])) {
            throw new BadRequestException(sprintf('Unexpected value for parameter "%s": expecting "array", got "%s".', $key, get_debug_type($value)));
        }

        return $value;
    }

    /** * Returns the parameter keys. */
    public function keys(): array
    {
        return array_keys($this->parameters);
    }