Extra (not in the plan): does any formula syntax compute? 2026-10-20 14:12:50 UTC+8, fresh Calc project, A1..A3 = 17, 25, 58

$ cli-anything-libreoffice --json document new --type calc --name F -o f.lo-cli.json >/dev/null && for c in 'A1 17' 'A2 25' 'A3 58'; do cli-anything-libreoffice --project f.lo-cli.json calc set-cell $c --type float >/dev/null; done; cli-anything-libreoffice --project f.lo-cli.json calc set-cell A4 0 --type float --formula '=A1+A2'; cli-anything-libreoffice --project f.lo-cli.json calc set-cell A5 0 --type float --formula '=SUM([.A1:.A3])'; cli-anything-libreoffice --project f.lo-cli.json calc set-cell A6 0 --type float --formula 'SUM(A1:A3)'; cli-anything-libreoffice --json --project f.lo-cli.json export render f.pdf -p pdf --overwrite >/dev/null; pdftotext -layout f.pdf -
# 14:12:50 UTC+8 | 2.18 s | exit 0
# stdout:
Set A4 = 0
ref: A4
sheet: 0
value: 0.0
type: float
formula: =A1+A2
Set A5 = 0
ref: A5
sheet: 0
value: 0.0
type: float
formula: =SUM([.A1:.A3])
Set A6 = 0
ref: A6
sheet: 0
value: 0.0
type: float
formula: SUM(A1:A3)
     17
     25
     58
Err:510
Err:510
Err:509


content.xml of the same project exported to ODS (the CLI's own writer):
<table:table-cell table:formula="of:=A1+A2" office:value-type="float">
<table:table-cell table:formula="of:=SUM([.A1:.A3])" office:value-type="float">
<table:table-cell table:formula="of:SUM(A1:A3)" office:value-type="float">

Result: all three formula cells show Err:510 / Err:510 / Err:509 after LibreOffice renders them, including '=A1+A2', the syntax used in the harness's own unit test (test_core.py:196), which only checks the XML string, not the computed value.