Macro downcast_named_arg

macro_rules! downcast_named_arg {
    ($ARG:expr, $NAME:expr, $ARRAY_TYPE:ident) => { ... };
}

Downcast a named argument to a specific array type, returning an internal error if the cast fails

$ARG: ArrayRef $NAME: name of the argument (for error messages) $ARRAY_TYPE: the type of array to cast the argument to