Any future for true associative arrays?

[stbalbach]

I use associative arrays regularly in Lua and awk but Nim doesn't really have 
the same. Is there a roadmap or is it too angular to implement?

I'd like to be able to do something like this (pseudo-code to unique a list of 
words):
    
    
    import strutils
    
    var
      arr = split("Blue Blue Red Green", " ")     # list of words
      uniqarr = newSeq[string](0)                 # array to hold unique words
    
    for i in arr:                                 # unique the list
      uniqarr[i] = 1
    
    for j in uniqarr:                             # echo the list
      echo j
    

(There are other methods in Nim to unique, this is a demo of associative array 
technique)