class Bundler::Source::Rubygems

def fetch_specs
  # remote_specs usually generates a way larger Index than the other
  # sources, and large_idx.use small_idx is way faster than
  # small_idx.use large_idx.
  if @allow_remote
    idx = remote_specs.dup
  else
    idx = Index.new
  end
  idx.use(cached_specs, :override_dupes) if @allow_cached || @allow_remote
  idx.use(installed_specs, :override_dupes)
  idx
end