Was there an evolution in format from (HIGH . LOW), via (HIGH LOW), to
(HIGH LOW MICRO)?
Yes. Both (HIGH LOW) and (HIGH LOW MICRO) are valid now.
It is useful to accept (HIGH . LOW) as well.
Shall I fix time-less-p and time-subtract to deal with (HIGH LOW
MICRO) arguments as well?
Yes, please do.
Should they deal with (HIGH . LOW) too?
It would not be a bad thing.
What about the return value of time-subtract (and time-add): should it
be backward compatible in the sense that it returns (HIGH LOW) if both
its arguments are of that format?
Yes.
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