I have just ordered one of the new Nov 2018 MacBook Airs that only come with Thunderbolt 3 (USB-C) ports. 

Does there exist a Thunderbolt 3 to Gigabit ethernet adapter?

Notes:

1. I am aware of the many USB-C to gigabit ethernet adapters that exist -- but I am looking for an adapter that takes advantage of Thunderbolt 3, the lower latency, and lower overheads. For example, on my old MacBook Air (2014), I use a Thunderbolt to Ethernet adapter ---> NOT a USB to Ethernet adapter.

2. I am aware I can buy a Thunderbolt 3 to Thunderbolt adapter, and then plug in my Thunderbolt to Ethernet adapter ... but I don't want a double dongle. Who does?

Just looking for a simple clean solution. 

[Also interested in Thunderbolt 3 to HDMI adapter --- same issue. ]