Re: Should we be touching goops?

[Dan Eble]

On Jun 2, 2022, at 20:32, David Kastrup <dak@gnu.org> wrote:
> 
> #(define-method (+ (a <Moment>) (b <Moment>)) (ly:moment-add a b))
> #(define-method (- (a <Moment>) (b <Moment>)) (ly:moment-sub a b))

Could we also introduce a distinction in type between points and spans of time? 
 "Measure 12 minus Measure 8" is 4 measures, but it is not Measure 4; and 
"Measure 12 plus Measure 8" is not a thing.
— 
Dan