With tiny modular utilities this is very much necessity - and not a bad idea if the different versions are being used in different contexts. For instance, when

With tiny modular utilities this is very much necessity - and not a bad idea if the different versions are being used in different contexts. For instance, when using gemified javascript libraries with bundler it is painful to upgrade to a different version of a javascript library for the user facing site while letting the backend admin interface continue using an older one for compatibility with other dependencies.