second_order_w value against the default schemeInternal helper that validates a second_order_w value against the default
first-order slot (flux = "upwind", bin_average = FALSE) and returns the
resulting named list. Used by the model constructors to work out the target
flux and bin_average entries before the rest of the model is built.
resolve_second_order_w(value)The resolved second_order_w list.
The value to resolve, as accepted by second_order_w<-.