...making class members reference counted or owned instead. Owned resources should be deleted automatically when...

...a refcount of 1 into a GC-owned non-shared object could be desirable.

Yes...

...copy.  (or not  copy if the caller owned stack array still live when promise resolved...

...a temporary view into an internal buffer owned by the provider. With reference counting, you...

...require that their held value either is owned by the promise, or has infinite lifetime...

...kinds of consecutive objects: nameless dynamic arrays owned by the GC, static arrays, dynamic arrays...

...be slices that point to the memory owned by this array so you cant just...

...support safe use of both of owned and non-owned/GC memory (or "managed" and...

...no pointer to GC memory is ever owned or mutated by any thread unknown to...

...Rust with owned values where one thread can only work mutably on an owned value...