Is there a curated 'awesome approaches to implimenting OO constructs' site(s)?
This is not object oriented patterns collection, but metadata constructs used to provide the object oriented constructs in a language. aka C++ vtable, lisp slots
[1] : https://blog.abdulrah33m.com/prototype-pollution-in-python/
Common Base Language: http://www.edelweb.fr/Simula/scb-1.pdf
The Development of the SIMULA Languages: https://hannemyr.com/cache/knojd_acm78.pdf and at https://dl.acm.org/doi/10.1145/800025.1198392
Some features of the SIMULA 67 language: https://dl.acm.org/doi/10.5555/800166.805258
Looks wouldn't be a duplicate 'awesome' site.
Two more:
1) A Theory of Objects by Abadi and Cardelli.
2) Putting Metaclasses to Work by Forman and Danforth (Guido Van Rossum recommends it on Amazon!).