In both 2.18 and 2.19, \unset appears to set a context property to the
built-in default, rather than the default set in the \with {} block:

music = \relative c' {
  \tuplet 3/2 {
    c8 c c d d d e e e f f f |
  }
  \set Staff.tupletSpannerDuration = #(ly:make-moment 1/2)
  \tuplet 3/2 {
    c8 c c d d d e e e f f f |
  }
  \unset Staff.tupletSpannerDuration
  \tuplet 3/2 {
    c8 c c d d d e e e f f f |
  }
}

\new Staff \with {
  tupletSpannerDuration = #(ly:make-moment 1/4)
} \music

In cases like this, I would find it useful to reset the property to the
custom default value without having to explicitly \set it every time. Is
there a way to do this? Also, is this the most useful behavior of \unset?

Saul
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