Re: A pure Nim k-d tree

[brentp]

[https://nim-lang.github.io/Nim/manual.html#types-unchecked-arrays](https://nim-lang.github.io/Nim/manual.html#types-unchecked-arrays)
 Then you could store the length in the tree and not incur the cost of having 
length + cap, etc. for a using a seq for every point.