Doesn't he have a point? Shouldn't Rails' asset tag helper(s) be
Don't include a query string in the URL for static resources.
Most proxies, most notably Squid up through version 3.0, do not
cache resources with a "?" in their URL even if a Cache-control:
public header is present in the response. To enable proxy caching for
these resources, remove query strings from references to static
resources, and instead encode the parameters into the file names