json4s/json4s — pull request #55 by thomassuckow (2013-07-05 20:41:55+00:00)
Title: Fixes #51 - Performance of arrays

Remove the O(n^2) reversal when decomposing arrays
* Make result of JsonWriter O(1) operation
* Don't unnecessarily access result of JsonWriter ( This makes addNode O(1), otherwise ListBuffer mutations become O(n) )