A handful of open-arm rows disagree with their deposition on a knife edge that no test
available to us settles. They were handled three different ways - silently overridden to
our answer, marked unscored, or left failing - and none of the three says what is true:
either answer is acceptable as long as the program picks one of them.
A manifest row can now list `ref_alternatives`. Each entry replaces the reference fields
it names - a space group, a cell, or both - and the row passes if the answer matches any
of its references, the deposition included. `ref` keeps the deposited values verbatim in
every case. Every alternative must carry `why`: an accepted alternative with no stated
reason raises rather than passing, so the mechanism cannot be used to launder a failure.
The report keeps these rows visible rather than folding them into the passes: a summary
column counting them, their own segment in the verdict bars, and a section naming each
row, what we read, what was deposited and the reason both are accepted.
Five rows use it. Four are symmetry: a tetragonal row where the refinement test is split
and its spread exceeds the effect, and three trigonal rows where we read a higher point
group - one where the evidence favours our answer, one where our own twin-immune test
favours the deposition, one unresolved in either direction. The fifth is a cell: a real
tNCS supercell whose (0,1/2,1/2) sublattice is what was deposited, both being correct
descriptions of the same lattice. The documentation frames all of them as open questions,
not as errors in a deposition, and states the limit: a merohedral twin at exactly one half
and true higher symmetry predict identical intensities, so no test can close them even in
principle.
`test_score.py` covers the new path: both answers accepted, the other hand of an
alternative, a third answer still failing, the cell case, and the missing-justification
schema error.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nW6FNRP1bBJJ8pfHiByAT
leonarski_fandClaude Opus 5
0c91749a41