Could D be used by Jonathan Blow rather jai language?

[Ola Fosheim Grostad]

On Saturday, 21 November 2020 at 01:52:36 UTC, Bruce Carneal 
wrote:
> If "it", whatever that is, precludes safe parallelism in 
> libraries or language extensions then "it" should be removed 
> from the language.
>
> Again, defaults really matter here.  If the right way is the 
> default way then leaving the "wrong" way escape hatch costs 
> less, in my view, than forcing two or more languages.

Well, @safe just means memory safe, not sure if it is meant to 
also cover multi threading safety?

The guarantees are not very clear to me.

It is also not clear what happens if you allocated something as 
shared, cast away shared and the call free(). Are you allowed to 
have two separate heaps?

It is unclear if D programmers follow the same principles or just 
rely on testing with the current runtime. If it is the latter 
then it will be difficult to get clean nonbreaking  semantics.