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CSV/text export: General numbers without exponents (integers below 1e16 exact); & switches to scientific past 21 characters - #449
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The 2^53 cutoff turned exact 16-digit integers (9007199254740992, 9007199254740994) into 9.00719925474099E+15. A General number is now written with &'s 15 digits but never with an exponent: reopening a CSV gives a scientific number a 0.00E+00 format that rounds it on the next save. 1E+15 and up are written as the shortest round-trip digits (every integer below 1e16 exactly, main's output above), small numbers as their 15 digits in full.
From 1E+15, CSV export writes the shortest round-trip digits, not &'s 15 digits. 'Every digit' now applies only to integers below 1e16. The open/save round-trip claim is narrowed to files GridCraft wrote. The doc now lists what a foreign CSV loses on its first save: 16-17-digit decimals are cut to 15 digits, and scientific input is rounded to its 0.00E+00 format. The 21-character switch is Excel-verified only for positive 15-digit mantissas. Shorter mantissas from 1E-6 to 1E-9 and negatives are marked as inferred, and the doc states the sign isn't counted. The function-parity 'was' value is corrected to main's 0.00000001.
neilcawse
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& switches to scientific past 21 characters
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Read the whole code diff at b0c3d8e (core number_to_text, numfmt format_value_full/general_full/render_general, engine display.rs and io.rs, the IM function tests, the docs rows). One mechanism now writes General numbers to CSV/TXT: number_to_text's 15 digits below 1E+15, the shortest round-trip digits from there (every integer below 1e16 exact), and never an exponent, so a reopened file does not pick up a scientific format that rounds on the next save. The special case in io.rs that this replaces is covered by the new tests (12-digit part codes, 2^53 and the even integers above it, 1e20, 1e15-0.5), and a reopen-and-save-again equality check is included. cell_text and print keep the cell-width General through shown_text and value_text_as, and TEXT(x,"General") passes full=false, so grid, print and TEXT output are unchanged. The wider effect on number_to_text (&, CONCAT, TEXTJOIN, IM* results) is stated in the PR, with the small-magnitude cases checked against Excel-cached IM results and unit tests for each boundary. I traced the rounding-first step for 999999999999999.5, 9.999999999999999e-10 and 9.999999999999999e-6 and the results match the asserted ones.
The thread has a real-file confirmation on Windows (twenty 12-digit part codes written back intact).
Validation: source reading plus the hosted cargo xtask ci check, green at b0c3d8e on a clean merge with main. No local tests were run (builds are paused).
# Conflicts: # docs/file-format-parity.md
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| Layer / File(s) | Summary |
|---|---|
Number-to-text rounding and notation crates/core/src/value.rs, crates/calc/src/tests.rs, crates/functions/src/engineering.rs, docs/function-parity.md |
number_to_text uses rounded 15-significant-digit values to select decimal or scientific notation. Tests cover boundary values, concatenation functions, and complex-number output. |
Full-width General formatting crates/numfmt/src/lib.rs, crates/numfmt/src/render.rs, crates/numfmt/src/tests.rs |
The formatter adds a full-width General path and passes preformatted text to the General renderer. TEXT() continues to use width-limited formatting. |
Delimited export integration crates/engine/src/display.rs, crates/engine/src/io.rs, crates/engine/src/io/tests.rs, docs/file-format-parity.md |
Display formatting separates cell-width output from full-width value output. CSV/TSV export uses full-width value text. Tests cover formatted values and export round trips. |
Estimated code review effort: 3 (Moderate) | ~25 minutes
Change: Bug fix
Sequence Diagram(s)
sequenceDiagram
participant Export as CSV/TSV export
participant Display as display::value_text
participant Formatter as format_value_full
participant NumberFormat
Export->>Display: Format each cell
Display->>Formatter: Format value
Formatter->>NumberFormat: Apply full-width General formatting
NumberFormat-->>Display: Return formatted text
Display-->>Export: Return cell text
Possibly related issues
- storytold/gridcraft#2574 — The PR changes the CSV number-rendering path, but does not implement locale-aware custom-format rendering.
- storytold/gridcraft#506 — The PR preserves exact integer digits in General CSV export, addressing the reported saved-file behavior.
- storytold/gridcraft#2648 — The PR changes export to use rendered cell text for General numbers, but currency text and rounded non-General values remain outside this change.
Suggested reviewers: aiongg, dylanmtaylor, echelon
Merge Risk: 
65257
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The reviewed changes present no identified issue that needs to be resolved before merging.
Architecture risk: 
65257
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The change affects 2 systems.
Changed systems:
crates,docsArchitecture concerns
No architecture-level concerns identified.Review details
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Systems and components
- observed — crates (service) was modified; 9 changed files map to changed impact.
- observed — docs (service) was modified; 2 changed files map to changed impact.
Before / after behavior
- observed — Modified behavior in crates/numfmt/src/render.rs: Removed the unused
format_general_fitimport from the decimal helpers. - observed — Modified behavior in crates/numfmt/src/render.rs:
render_generalnow receives preformatted general text and emits it directly forTok::General; the previous numeric formatting, width constraint, and#fallback were removed. - observed — Modified behavior in crates/core/src/value.rs:
number_to_textnow documents and applies decimal/scientific selection using the rounded 15-digit mantissa: scientific notation is used outside exponents-9through14, for sub-unit values needing over 19 decimal places, and when rounding reaches1E+15. This replaces the prior magnitude check, which useda.round()for small values and selected notation based on magnitude rather than decimal length. - observed — Modified behavior in crates/core/src/value.rs: The
number_textexpectations now include signed values just below1E+15, rounding near1E-9, and decimal output for rounded values below the scientific threshold. A newnumber_text_small_magnitudestest checks decimal-length boundaries, positive and negative small-number formatting, and large-number formatting around1E+15.
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Pre-merge checks: 
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly describes the main changes: General-number CSV/text export without exponents and updated scientific-notation behavior for &.Docstring Coverage Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Inline comments:
Review comments at @docs/file-format-parity.md:
- Line 88: Add the missing 2026-10-19 minor revision row for XLSX text boxes and
shapes preserving paragraph right-to-left direction on save, placing it next to
the existing HTML right-to-left entry in the revision history table.
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crates/calc/src/tests.rscrates/core/src/value.rscrates/engine/src/display.rscrates/engine/src/io.rscrates/functions/src/engineering.rscrates/numfmt/src/lib.rscrates/numfmt/src/render.rscrates/numfmt/src/tests.rsdocs/file-format-parity.mddocs/function-parity.md
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Re-reviewed 3d19fa4: the current CSV/TXT General-number export changes and merge-context adjustments preserve the previously reviewed behavior and regressions. Verified exact-head hosted cargo xtask ci run 39366072369. No local tests were run.
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Excel check of the claims in this description. Real Excel (Windows, version 16.0, en-US) driven through COM on temporary workbooks, nothing saved to the repo; General cells, CSV export: matches what the description says Excel does, so GridCraft intentionally differs. Excel writes the cell display, capped at 11 characters, in both CSV types (CSV UTF-8 adds the BOM; here the file did end with a line break). Written text, in cell order:
Opening a CSV in Excel with both the long text (
Matches: Not checked: Excel for Mac (the PR's numbers came from there), the GridCraft code, the reopen/save-again behaviour of GridCraft's own CSV reader. |
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Thanks for running the Windows Excel COM checks, @Harrison-Booth.
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Re-review at SHA 65257b7 (my last APPROVE was at 3d19fa4).
What it does: number_to_text (used for &, CONCAT, TEXTJOIN) now rounds to 15 significant digits first and picks decimal vs scientific from the rounded magnitude, with Excel's 21-character limit for small values. Since my last review the PR-only delta is: the new tests moved from io.rs to io/tests.rs (content identical, same line count), docs "Last updated" dates bumped, and the final shape of the value.rs change.
Checked: read the number_to_text change in full. mag comes from the rounded {:.14e} form, so 999999999999999.5 gives 1E+15 and 9.999999999999999e-10 gives 0.000000001. decimals_below_one = -mag - 1 + sig gives 19 for 6.92361330972509e-5 (stays decimal) and 20 for 1.28233995888454e-6 (scientific), matching the doc comment. The later (14 - mag) decimals still use the same mag. Gate is green at this head.
Not verified: I did not run the tests locally; the negative and 1E-6..1E-9 limits are, as the comment says, inferred rather than Excel-verified.
What main still gets wrong
Main (84acf62) special-cases plain
Generalinio.rs::csvwith Rust'sf64::to_string(), and leaves every other General through the 11-character cell display. Saving one row on main gives:0.1+0.20.300000000000000040.31/30.3333333333333333(16 digits)0.3333333333333331/3*1E-60.00000033333333333333330.000000333333333333333124412140710[Blue]General1.24412E+11124412140710-124412140710General;[Red]-General-1.24412E+11-124412140710124412140710@(Text)1.24412E+11124412140710124412140710General" mm"1.24412E+11 mm124412140710 mm1234567890123456,900719925474099412345678901234567,1E+20,1E15-0.512345678901234568,100000000000000000000,999999999999999.5Same for
.txt/.tsv. Excel never shows binary noise like0.30000000000000004: its text conversion (&) stops at 15 significant digits. A CSV export never writes an exponent for a General number, though: reopening the file gives a number typed as1.23456789012346E+16a0.00E+00format, and the next save writes1.23E+16. So a number of 1E+15 or more is written as the shortest digits that read back as the same value (every integer below 1e16 that f64 stores is written exactly, so a 16-digit card or order number survives; larger ones as main wrote them, e.g.12345678901234568, 2^70 as1180591620717411300000), and a small number as its 15 significant digits in full. A CSV GridCraft wrote, opened and saved again, is unchanged. A CSV from elsewhere can change on its first save: a 16- or 17-digit decimal is cut to 15 digits, as in Excel (3.141592653589793→3.14159265358979; main kept it), and a number typed in scientific notation gets the old0.00E+00parse format and is saved rounded to it (1.23456789012346E-10→1.23E-10, the same on main). Measured withgridcraft-cli converton3.141592653589793,0.30000000000000004,1.50,1E+20,1.23456789012346E-10,12345678901234567(main:3.141592653589793,0.30000000000000004,1.5,1.00E+20,1.23E-10,12345678901234568; this PR:3.14159265358979,0.3,1.5,1.00E+20,1.23E-10,12345678901234568; a second save is byte-identical on both).How this compares with Excel (Excel for Mac 16.114, synthetic sheet, General cells): Excel's own Save As CSV UTF-8 writes General formatting capped at 11 characters per value, so a value that needs more than 11 characters loses digits. It writes
0.333333333for1/3,1.23457E+16for12345678901234567(already cut to 15 digits on entry),1.15292E+18for2^60,3.14159E+15forPI()*1E15,3.33333E-06for1E-5/3and1E-10. It also writes a UTF-8 BOM and no final line break. This PR writes0.333333333333333,12345678901234500,1152921504606847000,3141592653589793,0.00000333333333333333and0.0000000001, so it keeps more digits than Excel does, and never writes an exponent. Opened in Excel, the CSVs from this PR (b0c3d8e) and frommain(6e984bb) give the same value in all ten cells, because Excel reads 15 significant digits. The one difference is that main's longer text for0.1+0.2,1/3and1E-5/3is cut on reading.Change
gridcraft_numfmt::format_value_full: likeformat_value, but a number shown as General (General or Text section, with colour/literals) isn't narrowed to the cell width. It is written by the privategeneral_full:gridcraft_core::number_to_text(the&conversion), unless that text has an exponent; then{}(shortest round trip, main's output) for |n| ≥ 1, or the 15 digits written out for |n| < 1.render_generaltakes the already-written General text; privateformat_numbergains afullflag (grid callers and the existing numfmt test helper passfalse).gridcraft_core::number_to_textis not export-only: it is the conversion behind&, CONCAT, TEXTJOIN, VALUETOTEXT, the IM functions' complex text, the formula printer and pivot/chart labels, and all of them change:=(1E15-0.5)&""gives1E+15(main:1000000000000000, 16 digits).0.plus 19 decimals; a minus sign is not counted). Excel for Mac cachedIMCSCH("13+5j")as1.28233995888454E-06+4.33496947416312E-06j,IMEXP("-13+25j")as2.24044486393732E-06-2.99158552811404E-07j, and IMTAN/IMSECH parts as0.0000692361330972509/0.000241377759972715(theformulasproject's test.xlsx in the corpus). So=(9.99999999999999E-9)&""gives9.99999999999999E-09(main:0.00000001), and=1/3*1E-5&""gives3.33333333333333E-06(main:0.00000333333333333333). Only 15-digit mantissas are Excel-verified. The boundary for shorter mantissas from 1E-6 to 1E-9 (e.g.0.0000099999999999999stays decimal) and the decision to leave the sign out of the count are inferred, not checked against Excel.1E-10,0.000000001).display::value_text(used only by CSV/text export) usesformat_value_full;cell_textkeeps the cell-width General through a privateshown_text, unchanged behaviour.io.rs::csvdrops its plain-General special case and just callsvalue_text: one mechanism.delimited_exports_write_general_numbers_as_text_converts_them(CSV and TXT) fails on main with the values above.delimited_exports_preserve_general_precision_and_explicit_number_formatschecks 2^53, even integers above it,-9999999999999998,12345678901234567,1E+20,1E15-0.5and two small numbers, and that reopening and saving the CSV/TSV gives the same bytes.number_text_small_magnitudes(core) checks the Excel-cached values and the cases just below powers of ten (1E-10 to 1E-4, 1E14 to 1E16).text_joins_convert_numbers_to_15_significant_digits(calc) covers&, CONCAT and TEXTJOIN.complex_numbers(functions) checks the Excel-cached IMCSCH, IMEXP and IMSECH text.docs/file-format-parity.md: merges the duplicate (contradictory) CSV/text rows and records the intentional difference from Excel, which writes the cell display (1.24412E+11,0.333333333).docs/function-parity.mdrecords the&conversion change.The earlier "Fix main CI" commit (French header/footer labels, plain-General CSV) is dropped: main fixed both.
Review
Three adversarial review rounds ran.
Round 1:
number_to_textrounds to 15 digits before choosing decimal or scientific, so values in [999999999999999.5, 1e15) no longer give a 16-digit integer.Round 2:
9.00719925474099E+15. CSV export now writes every integer below 1e16 exactly.12345678901234568,100000000000000000000). No General number is written with an exponent, because reopening the file would give it a scientific format and the next save would round it:9.00719925474099E+15became9.01E+15, and1.23456789012346E-10became1.23E-10, on the build before this round. As a result,1E15-0.5exports as999999999999999.5again (main's), while&gives1E+15.number_to_textaffects every&-style conversion, not only export, and this is now documented. Its small-number switch now matches Excel's cached results (above), not a fixed 1E-9 boundary.io.rs::csv,format_value_fullandvalue_textare fixed. The "(|x| < 2^53)" wording is gone.Round 3 (no code bug; wording only):
io.rs::csvanddisplay::value_textand the file-format-parity header no longer say export writes&'s 15 digits for every General number: from 1E+15 it writes the shortest round-trip digits (999999999999999.5,12345678901234568). "Every digit" now applies only to integers below 1e16.number_to_textdoc comment, which also says the sign isn't counted.=(9.99999999999999E-9)&"": it is0.00000001on main (measured withgridcraft-cli eval). The row now also marks the inferred boundaries.mainf1894c6 (44526f0). Onlydocs/file-format-parity.mdanddocs/function-parity.mdconflicted (the header line and changelog rows); both sides' rows are kept, newest first, and main's change is listed as "previously" in the header. An adversarial review of the merge against both parents found nothing; it also checked the code that merged without conflicts against main's new formula length and nesting limit (Formula parser: Excel's 8,192-character limit and postfix nesting (never crash) #1330) and the large-range clear recalculation (fix(edit): recalculate all changed cells after large-range clears #1128).cargo xtask cipasses all 8 steps on the merge.main19f4387 (f410a77). This merge conflicted incrates/engine/src/display.rswith Conditional formatting: show a rule's number format (fixes #1163) #1769, which splitvalue_text_asout ofvalue_textso that print uses the number format of a conditional format. Resolution:value_text(CSV/Text export) keeps this PR'sformat_value_full, andvalue_text_askeeps main's cell-display formatting, so print output is the same as on main.shown_text(the cell display) now callsvalue_text_as. An adversarial review traced every caller (CSV/TSV, print, grid, clipboard, find, remove duplicates) and found nothing. It ran the engine, numfmt and core tests (390 passed), a CSV export of124412140710in General (written as124412140710) and main'sconditional_number_format_prints.cargo xtask cipasses all 8 steps on the merge.mainc30fa3f (b0c3d8e, Fix MEDIAN overflow for large finite middle values #1585: MEDIAN overflow). Conflicts:docs/function-parity.md(the header line and changelog rows). An adversarial review found nothing; it checked the remerge diff and how the MEDIAN/AGGREGATE midpoint fix interacts with this PR, and rancargo test -p gridcraft-calc -p gridcraft-functions(186 passed).cargo xtask cipasses all 8 steps on the merge.b0c3d8e(review), from reading the source plus the hostedcargo xtask ci. He covered the CSV/TXT General-number path (number_to_text,format_value_full,display.rs,io.rs) and its tests (12-digit part codes, 2^53, 1e20, 1e15-0.5, reopen and save again);cell_textand print keep the cell-width General. No findings.main23829d8 (42d3e9a). Onlydocs/file-format-parity.mdconflicted (its header line and changelog rows): it keeps main's single header line with this PR's change listed first, and both sides' rows. An adversarial review of the merge against both parents found nothing.cargo xtask cipasses all 8 steps on the merged head.cargo xtask cipasses all 8 steps on 3d19fa4.3d19fa4(review), from re-reading the change against the merge context and the hostedcargo xtask cirun on that head; no local tests.main06920de (f8c4dac; head 77cfbda). Conflicts:docs/file-format-parity.mdanddocs/function-parity.md(combined header lines with this PR's entry first; both sides' revision rows).number_to_textincrates/core/src/value.rsmerged without a textual conflict but lost main'slet a = n.abs(); restored, so this PR's 15-digit General rendering and main's scientific-notation boundary both hold. Adversarial review of the merge against both parents: one finding, revision rows out of date order, fixed in 77cfbda.cargo xtask cipasses all 8 steps on 77cfbda.Checks
cargo fmt --all;cargo clippy -p gridcraft-core -p gridcraft-numfmt -p gridcraft-functions -p gridcraft-calc -p gridcraft-engine --all-targets -- -D warnings;cargo test --no-fail-fastfor those crates plusgridcraft-formula,gridcraft-xlsxandgridcraft-chart: all pass. Each new regression test fails on the previous head (4dd4ff9).cd /tmp/gc-corpus2 && .venv/bin/python run.py <release gridcraft-cli> results-449-bf9b3cb, compared per file againstresults-main-84acf62(summedtotals.mismatchedandroundTripDiffering): no file is worse.test__test_files__test.xlsximproves from 1326 to 1321 calc mismatches (the IM text above). Two files hit the 60 s timeout on a machine with load average ~200; rerun withGC_TIMEOUT=600(results-449-bf9b3cb-retry), they match main (18097 and 0 mismatches). Summed over all files: 68,964 on main, 68,959 here.cargo fmt --all;cargo test --no-fail-fast -p gridcraft-core -p gridcraft-enginepass. The foreign-CSV and 2^70 outputs quoted above come fromgridcraft-cli converton the release builds of 84acf62 and bf9b3cb.cargo xtask cipasses all 8 steps (fmt, clippy, test, assets, layers, wasm, parity, keytips) on the head commit 9cbbaae.Summary by CodeRabbit