I took finally time to rework the Cljsjs package checksum validation
https://github.com/cljsjs/boot-cljsjs/blob/master/src/cljsjs/boot_cljsjs/packaging.clj#L211-L253
https://github.com/cljsjs/packages/blob/master/react/build.boot
@juhoteperi how do you suggest using React 16 from CLJSJS in older browsers?
(needs Map, Set polyfill, etc)