Yes. We're talking about growing time_t from int32_t to int64_t, instead of uint32_t. If you change it to uint32_t behind the scenes, some code will silently

Yes. We're talking about growing time_t from int32_t to int64_t, instead of uint32_t. If you change it to uint32_t behind the scenes, some code will silently fail while compiling OK, because it was not expecting unsigned math.