reservedCommonKeys constant
Keys reserved by the SDK — cannot be overwritten via public common properties API. Includes core SDK fields and default user property keys (device, geo, app_*).
Implementation
static const Set<String> reservedCommonKeys = {
'sdk_ver',
'sdk_ver_num',
'appid',
'platform',
'device',
'geo',
'app_id',
'app_platform',
'app_store',
'app_version',
'ip_country_code',
};