RedirectBehavior

    pub const RedirectBehavior = enum(u16) {
        /// The next redirect will cause an error.
        not_allowed = 0,
        /// Redirects are passed to the client to analyze the redirect response
        /// directly.
        unhandled = std.math.maxInt(u16),
        _,

        pub fn init(n: u16) RedirectBehavior {
            assert(n != std.math.maxInt(u16));
            return @fromBackingInt(@intCast(n));
        }

        pub fn subtractOne(rb: *RedirectBehavior) void {
            switch (rb.*) {
                .not_allowed => unreachable,
                .unhandled => unreachable,
                _ => rb.* = @fromBackingInt(@intCast(@backingInt(rb.*) - 1)),
            }
        }

        pub fn remaining(rb: RedirectBehavior) u16 {
            assert(rb != .unhandled);
            return @backingInt(rb);
        }
    }