Questionable beaming

[Wiz Aus]

With the following snippet

\relative{
  \time 4/4
  c4 c4. c8 c r
  \time 3/4
  c8 c4 c8 c r
  c4. c8 c r
  r c c c4.
}

I would not expect any of the quavers to be beamed.

The last 3/4 case seems especially obvious: a beam should never end on the 
2nd crotchet in a 3/4 bar (I gather this might be tweakable).

I'll try to find some published examples.

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