Struggling to understand use of ptr object Types

[Araq]

You are confused about absolutely nothing. `create` does exactly what you think 
it does, namely `cast[ptr T](alloc0(sizeof(T) * size))` and it's just that you 
passed the wrong `T`. You can conclude from that that `ptr object` is to be 
avoided but in reality it's just that `create` is not very useful -- when you 
use `ptr` it's usually for C interop or custom allocation needs. In these cases 
the `alloc0` (Nim's allocator) is rarely what you want.