def svg_asset_data_uri(asset)
      svg = asset.source.dup
      optimize_svg_for_uri_escaping!(svg)
      data = Rack::Utils.escape(svg)
      optimize_quoted_uri_escapes!(data)
      "\"data:#{asset.content_type};charset=utf-8,#{data}\""
    end
def svg_asset_data_uri(asset)
      svg = asset.source.dup
      optimize_svg_for_uri_escaping!(svg)
      data = Rack::Utils.escape(svg)
      optimize_quoted_uri_escapes!(data)
      "\"data:#{asset.content_type};charset=utf-8,#{data}\""
    end
Returns a URI-encoded data URI (always "-quoted).