`core.time.Duration` has a `total` function for extracting the
value withing the Duration. `total` returns a whole number
(`long`). Is there a function that returns a decimal (`double`
or `float`)?
I cannot find one in `core.time`. How would I do it then?
I know I can get finer precision (say msecs) and then divide it
to get a courser precision (say secs) but then I might loose some
potential accuracy. I could do nsecs but that could be finer
than than the actual internal number and therefore cause extra
calculation or end up truncating really large numbers.
I would think a function that this would be appropriate to belong
in the module. Am I missing it? Or, how would you recommend
calculating it?
tldr: I am looking for a function like `double as(string
units)(Duration)`.
