-impl_writeable_primitive!(u64, be64_to_array, 8, slice_to_be64);
-impl_writeable_primitive!(u32, be32_to_array, 4, slice_to_be32);
-impl_writeable_primitive!(u16, be16_to_array, 2, slice_to_be16);
+impl_writeable_primitive!(u64, 8);
+impl_writeable_primitive!(u32, 4);
+impl_writeable_primitive!(u16, 2);