Re: Most efficient way to implement a stack using Nim?

[zevv]

I use seqs as stacks extensively in one of my projects, and I found these are 
generally ok _unless_ you need to unwind your stack frames more then one item 
at a time: I believe `setLen()` can invoke the GC and cause performance 
degradation. Instead, I use a seq for storage but keep my own top value and 
provide some access functions which merely update the top value and read/write 
the seq's contents.