def precompiled_assets(clear_cache = false)
      @precompiled_assets = nil if clear_cache
      @precompiled_assets ||= assets_manifest.find(config.assets.precompile).map(&:logical_path).to_set
    end
def precompiled_assets(clear_cache = false)
      @precompiled_assets = nil if clear_cache
      @precompiled_assets ||= assets_manifest.find(config.assets.precompile).map(&:logical_path).to_set
    end
Lazy-load the precompile list so we don't cause asset compilation at app
 boot time, but ensure we cache the list so we don't recompute it for each
 request or test case.