src/ConfigurationResolver.php
private function checkType(array $valid, $name, $provided)
    {
        foreach ($valid as $check) {
            if (isset(self::$typeMap[$check])) {
                $fn = self::$typeMap[$check];
                if ($fn($provided)) {
                    return;
                }
            } elseif ($provided instanceof $check) {
                return;
            }
        }

        $expected = implode('|', $valid);
        $msg = sprintf(
            'Invalid configuration value provided for "%s". Expected %s, but got %s',
            $name,
            $expected,
            describeType($provided)
        );
        throw new \InvalidArgumentException($msg);
    }
private function checkType(array $valid, $name, $provided)
    {
        foreach ($valid as $check) {
            if (isset(self::$typeMap[$check])) {
                $fn = self::$typeMap[$check];
                if ($fn($provided)) {
                    return;
                }
            } elseif ($provided instanceof $check) {
                return;
            }
        }

        $expected = implode('|', $valid);
        $msg = sprintf(
            'Invalid configuration value provided for "%s". Expected %s, but got %s',
            $name,
            $expected,
            describeType($provided)
        );
        throw new \InvalidArgumentException($msg);
    }
@param array $valid Array of valid types.
@param $name Name of the configuration option.
@param $provided Value to check the type of.

@throws \InvalidArgumentException.