[benreesman]

TIL. Thanks for letting me know that: https://doc.rust-lang.org/src/std/collections/hash/map.rs.ht...

I don't know how I missed this, is the Swiss port a fairly recent development?

[tialaramex]

Hashbrown (the Swiss Tables implementation) replaced the previous HashMap implementation in July 2019.

The port is a little older, 2018. The idea was famously explained at CppCon 2017, I don't know whether Google had published on Swiss Tables before that year.