How is that obvious? And which memory model does Odin use? Just to be clear: a "memory model" is not about memory management, it is about the behaviour of multithreaded programs: https://en.m.wikipedia.org/wiki/Memory_model_(programming)
The parent comment said: >then have a data race, it's functionally equivalent to undefined behavior
This is a matter of interpretation but there is a categorical difference between "this read is undefined so the compiler will silently omit it" and "this read will read whatever value is in the CPU cache at this address, even if the cache is stale". The difference is a matter of undefined behavior from the language versus the application being in an undefined state.
I totally agree.