Nim memory management is tied to the type you use.

You either use:

- an object. Which is on the stack and is either trivial or uses destructors and is suitable for embedded due to deterministic memory management

- a pointer object. Which is a raw pointer like C *. Managed directly via raw malloc/free or Nim malloc/free. Suitable for embedded

- a reference type. Which is managed by one of Nim GC or is an error if you use gc:none