I'd suggest removing them... It probably doesn't hurt in general to be explicit every time, but I don't think it helps much when you're calling functions from base or from the current package. For example, there's no way that a call to `revalue` would get something other than the function in plyr, and `names` would always be from base unless an explicitly imported package contained an object called `names`. Because of the way the namespace and imports environments are structured, it shouldn't be possible to accidentally access anything from an import of an imported package.