make merge_spec not dependent on Buffer existing
make merge_spec not dependent on Buffer existing

…because it doesn’t in browser environments.

DreamingPiggy/lazy.js,oli5679/lazy.js,VicNumber21/lazy.js,dtao/lazy.js,webcoding/lazy.js,webcoding/lazy.js,dtao/lazy.js,oli5679/lazy.js,VicNumber21/lazy.js,webcoding/lazy.js,VicNumber21/lazy.js,dtao/lazy.js,DreamingPiggy/lazy.js,Deide/lazy.js,Deide/lazy.js,Deide/lazy.js,DreamingPiggy/lazy.js,oli5679/lazy.js