how to refer to partial first bar using edition-engraver

[Mason Hock]

I have a score beginning with an 8th note pickup and want to place a \mark 
above the first note using edition-engraver. Edition-engraver appears to 
consider the first complete bar to be bar "1" and the timing mark "2 0/4" 
places tweaks at the beginning of the second complete bar. Therefore, my 
instinct was to use "0 7/8" for the bar/beat timing, but nothing appeared 
whether I used \mark or \markup. Next I tried "0 0/4" and got the same result. 
Interestingly, "1 0/4" places a \markup above the first complete bar, which is 
what I expected, but it places \mark in two locations, over the first note and 
over the clef. Placing a \mark over the first complete bar directly in the 
music, as opposed to using edition-engraver, places it as expected.

What is the correct way to place an editionMod in a partial bar? Here is a 
minimal example of the resutls described above:

----------------------------------------------------------
\version "2.21.0"

\include "oll-core/package.ily"
\loadPackage edition-engraver

\editionMod all 2 0/4 score.staff.Voice ->
\editionMod all 2 0/4 score.staff.Voice \f
\editionMod all 0 0/4 score.Score ^\markup { "markup1" }
\editionMod all 0 0/4 score.Score \mark "mark1"
\editionMod all 0 7/8 score.Score ^\markup { "markup2" }
\editionMod all 0 7/8 score.Score \mark "mark2"
\editionMod all 1 0/4 score.Score ^\markup { "markup3" }
\editionMod all 1 0/4 score.Score \mark "mark3"

\consistToContexts #edition-engraver Score.Staff.Voice
\addEdition all

\score {
  <<
  \new Staff \with { \editionID staff }
    \relative c' {
      \partial 8 d8 |
      d4\mark "mark4" d d d |
      d d d d
    }
  >>
  \layout {
    indent = 18\mm
    \context {
      \Score
      \editionID score
    }
  }
}
----------------------------------------------------------

Thanks,

Mason

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