When importing groups form CSV, debugging message is shown:
Did you remember to call setType() for 'id'? Defaulting to PARAM_RAW cleaning.
line 1289 of /lib/formslib.php: call to debugging()
line 281 of /lib/formslib.php: call to moodleform->detectMissingSetType()
line 202 of /lib/formslib.php: call to moodleform->_process_submission()
line 52 of /group/import.php: call to moodleform->moodleform()