Data corruption with Nashorn + Handlebars and concurrent requests

[Matt Kime]

I'm curious if any progress has been made on isolating whatever isn't
thread safe about handlebars template execution.

I'm also working on using Handlebars.js inside nashorn however i'm doing a
number of things different. i'm precompiling my templates using
https://github.com/gruntjs/grunt-contrib-handlebars and then compile the js
functions into cached bytecode.

I haven't checked for threading issues yet but I'm glad i found this
discussion so i know that i should.