How do I use /data modify in Minecraft 1.13.2?

Prior to Minecraft 1.13, the command /entitydata could be used to set the data on an entity. However in 1.13 this command got removed and merged into the /data command, according to the Minecraft Wiki.

However, I seem to only be able to get data using /data get. /data modify set seems to only get introduced in 1.14.

Is it not possible to use /data modify set in 1.13(.2) at all? Seems like a huge oversight to me to remove the old command without introducing the new one.