OptionaldelimiterOptionalexemptExempt a cell that is wholly a signed number (-0.35, +1, -1.5e-3)
from the +/- formula trigger, so spreadsheet SUM() still works on
exported measures (#1772). Default true.
A PRODUCT policy, not a security one. The exemption cannot weaken the
guard: the accepted language is built from + - . e E 0-9 and nothing
else, which cannot spell a function name, a cell reference or a (, so
every string it exempts is inert in a spreadsheet. =, @, TAB and CR are
never exempted, and a number with anything glued to it (-0.35=cmd) is not
wholly numeric and stays guarded.
The default used to be false, which made the repo disagree with itself:
@ifc-lite/lists exempted numbers, every other writer guarded them, and
both behaviours were deliberately tested. Exempting is now the default so
the policy lives in ONE place instead of at eleven call sites, where it
would drift. Pass false to opt a writer out.
This flag does NOT make a numeric column sum on its own; a cell that
arrives already display-formatted is not wholly numeric and no setting here
changes that. apps/viewer/src/lib/lists/export/csv.ts explains why.
OptionalquoteAlso quote a cell whose first or last character is whitespace, so an
importer that would otherwise trim the padding cannot (RFC 4180 §2.4 again,
from the other side). Used by the zones-table writer. Default false.
"Whitespace" here is JavaScript \s — deliberately pinned as an explicit
table in the shared fixture, because JS \s and Rust
char::is_whitespace are NOT the same set (JS has U+FEFF and lacks U+0085;
White_Space is the reverse), and that asymmetry is exactly the kind of
thing that becomes a silent cross-language split.
Column delimiter the cell will be joined with. Default
,.