Re: jit-lock timer etc.

[Richard Stallman]

    I can hardly imagine emacs being idle for more than 2^28 seconds, so
    it seems safe to simplify it to return a cons (SECS . USECS)  [see patch 
below]

I don't want to do that, because it would be incompatible with other
time values.  I'd rather people use time-to-seconds to convert.

However, returning the value in floating point might be a good method.
But if we do that, we should call it float-idle-time.