Array

    pub const Array = struct {
        len: comptime_int,
        child: type,

        /// The type of the sentinel is the element type of the array, which is
        /// the value of the `child` field in this struct. However there is no way
        /// to refer to that type here, so we use `*const anyopaque`.
        /// See also: `sentinel`.
        sentinel_ptr: ?*const anyopaque,

        /// Loads the array type's sentinel value from `sentinel_ptr`.
        /// Returns `null` if the array type has no sentinel.
        pub inline fn sentinel(comptime arr: Array) ?arr.child {
            const sp: *const arr.child = @ptrCast(@alignCast(arr.sentinel_ptr orelse return null));
            return sp.*;
        }
    }