\numericTimeSignature works on Staff level?

[Lukas-Fabian Moser]

Hi,

\numericTimeSignature works on Staff level - it has been this way since 
its first introduction by Graham Percival in 2008 
(929abcd11cf5305b0929e5ca75b12ffee9f57785). As a consequence,

\version "2.22.1"

<<
  \new Staff {
    \numericTimeSignature
    \time 2/2
    s1
  }
  \new Staff {
    s1
  }
>>

generates

What's the rationale for this behaviour (rather than making 
\numericTimeSignature act on Score level)?

By default, setting \time command affects all simultaneous staves, and I 
can't think of a reason why one should want "4/4" in one staff and "c" 
in another.

Of course there are polymetric situations where simultaneous numeric and 
non-numeric time signatures might be desired, but that's a comparatively 
rare use case, and if am moving around the Timing_translator anyway in 
\layout {}, I can also set Staff.TimeSignature.style manually.

Lukas