Thanks for the explanation. I mistakenly thought that "op" stood for
"operation". It makes much more sense if it means "options" :) I don't
know if any others had trouble with it, but if so, maybe "opt" would be
better. If it only occurs once in a record, then "options" is not so
bad.
opt == optional ?
opt == opt-{in|out} ?
opt == optimal (as in: best match would be ...)
probably more. There's always confusion, that's why we need to RTFM.
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