src/Route.php
protected function isMapped($name) {
        $name = strtolower($name);
        return isset($this->mappings[$name]) || isset(self::$globalMappings[$name]);
    }
protected function isMapped($name) {
        $name = strtolower($name);
        return isset($this->mappings[$name]) || isset(self::$globalMappings[$name]);
    }
Determine whether or not a parameter is mapped to special request data.

@param string $name The name of the parameter to check.
@return bool Returns true if the parameter is mapped, false otherwise.