HeaderValues8
typealias HeaderValues8<H1, H2, H3, H4, H5, H6, H7, H8> = Tuple8<HeaderValues<*>, HeaderValues<H1>, HeaderValues<H2>, HeaderValues<H3>, HeaderValues<H4>, HeaderValues<H5>, HeaderValues<H6>, HeaderValues<H7>, HeaderValues<H8>>(source)
Tuple of fixed header values with eight entries.