\compressMMRests vs. \compressFullBarRests and \expandFullBarRests

[Malte Meyn]

Hi list,

while looking where the documentation of restNumberThreshold could be 
adde to the NR (issue 5251) I realized that we have three ways to 
compress MMRs and all of them do basically the same (though 2 doesn’t do 
only one \set and one \unset but a \once \set for every rest):

1. \set Score.skipBars = ##t MUSIC \unset Score.skipBars
2. \compressMMRests { MUSIC }
3. \compressFullBarRests MUSIC \expandFullBarRests

2 is documented in English NR, 3 in German NR. I wasn’t aware of 2 until 
now and of course I prefer 3 because I’ve known it for long time, but 
also because you can put it in a \layout-\context block ;)

So now my question: Why are there both 2 and 3?

Cheers,
Malte