It should be able to detect that the date is not valid (and that their precision is wrong), and avoid sending a "If-Modified-Since" header. (The same would be t

It should be able to detect that the date is not valid (and that their precision is wrong), and avoid sending a "If-Modified-Since" header. (The same would be true if they were assigned at random rather than sequential like this; it still should be able to detect that they are not valid and have wrong precision.)