Setting beaming rules back to default

[Nick Payne]

If I use \set beamExceptions = ... to change beaming, should I be able 
to use \set beamExceptions = #'() to set the beaming rules back to the 
default settings? It doesn't work - I have to put in an explicit rule 
for whatever I've overridden to get it back to default settings. is this 
a bug or how it's supposed to work?

\version "2.13.38"
\relative c'' {
    \repeat unfold 8 {c8 }
    \set beamExceptions = #'((end . (((1 . 8) . (2 2 2 2)))))
    \repeat unfold 8 {c8 }
    \set beamExceptions = #'()
    \repeat unfold 8 {c8 }
    \set beamExceptions = #'((end . (((1 . 8) . (4 4)))))
    \repeat unfold 8 {c8 }
}

Nick

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