Time#inspect with frac
When Matz changed Time#to_s format in 2006, frac part of Time string is dropped because it is considered not useful.
But recently we encounters some troubles the comparison of Time objects whose frac parts are different.
For example a is original object and b is once stored in RDB (and dropped the frac part).
Or there're multiple time objects which are generated in a single HTTP request.
Of course they are different and assert_equal will be failed but inspect doesn't show the frac part.