Yes I understand. But as I mentioned earlier "How the end user (in this case Grab) want to interpret the tag is up to them". OpenStreetMap is community-edited map and the tagging should be based on local community consensus. Grab should not tag anyhow they want without the community consensus just because that's how Grab routing software interpret certain tag. Hence, we should consult the community first for the interpretation of the tag. 

Malaysia Telegram Community: https://t.me/OpenStreetMapsMalaysia