Besides a number of minor bug fixes, most notable changes
"es6" package-spec will generate es6 modules for each ocaml module, "es6-global" will also generate es6 modules but the path does not rely on node module resolution "amdjs-globa" is similar to "es6-global"
The es6 module is in perfect combination with rollup as a bundler, see this link about how good the dead code elimination is https://twitter.com/bobzhang1988/status/827562467148623875