P3: the IIF in plain ASCII with every change listed, and the CPA package as of one day (defects 7, 21)
The CPA package's general-journal.iif now holds every posted entry through as_of (closing entries left out, D-36), written as plain ASCII with CR LF, DOCNUM the entry id, QuickBooks Desktop's field limits and subaccount types honoured, and every character written differently listed in the export's warnings and the README (grouped by substitution, TINs masked). The 1099 worksheet stops at as_of too. PDFs print CJK, Arabic, Hebrew, Thai and Devanagari (Noto fallbacks, OFL), and so does the viewer. has_full_tin reads Unicode separators. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj
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@@ -13,8 +13,10 @@
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//! 2026-10-15); IRS truncated TINs: Treas. Reg. §301.6109-4.
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//! INVARIANTS:
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//! 1. No party field holds a full taxpayer identification number: any
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//! run of nine digits (single spaces or hyphens between them allowed)
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//! is refused. A W-9's TIN is kept as its last four digits only.
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//! run of nine digits, in any script, separated or not (`has_full_tin`:
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//! up to three spaces, hyphens, dots, slashes or underscores, in any
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//! of their Unicode forms, between neighbors) is refused. A W-9's TIN
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//! is kept as its last four digits only.
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//! 2. W-9 facts need a 1099 role (contractor or landlord); W-4 facts need
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//! the employee role. Taxpayer-ID facts (`TinFacts`: the TIN's type,
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//! last four, and vault record) are allowed for any role: members
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@@ -272,33 +274,100 @@ pub fn name_key(name: &str) -> String {
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name.trim().to_lowercase()
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}
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/// The characters that may sit between a TIN's digits: space, hyphen,
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/// dot, slash, underscore, and the Unicode dashes and no-break space
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/// (`291-12-2846`, `291.12.2846`, `291/12/2846`, `291 - 12 - 2846`).
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/// The characters that may sit between a TIN's digits (`291-12-2846`,
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/// `291.12.2846`, `291/12/2846`, `291 - 12 - 2846`): in ASCII a space,
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/// hyphen, dot, slash or underscore (no other, not a tab or a line
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/// break); past ASCII, every form of them Unicode has, so a TIN can't slip
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/// through typed in another script (`docs/spec/sources/unicode-tin-text.md`,
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/// Unicode 17.0): every space (general category Zs: the no-break, thin and
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/// ideographic spaces), every dash (property Dash: the hyphens, en and em
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/// dashes, minus sign, Hebrew maqaf, fullwidth and small hyphen-minus),
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/// and the characters whose compatibility form is a dot, slash or
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/// underscore (the fullwidth and small full stops, the one dot leader,
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/// the fullwidth solidus, the fullwidth and presentation low lines).
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fn tin_separator(c: char) -> bool {
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match c {
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' ' | '-' | '.' | '/' | '_' => true,
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c if c.is_ascii() => false,
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// White_Space less the line breaks (NEL, LS, PS): the Zs spaces.
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c if c.is_whitespace() => !matches!(c, '\u{85}' | '\u{2028}' | '\u{2029}'),
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c => matches!(
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c,
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// Dash (PropList.txt), less U+002D above.
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'\u{58A}'
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| '\u{5BE}'
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| '\u{1400}'
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| '\u{1806}'
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| '\u{2010}'..='\u{2015}'
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| '\u{2053}'
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| '\u{207B}'
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| '\u{208B}'
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| '\u{2212}'
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| '\u{2E17}'
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| '\u{2E1A}'
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| '\u{2E3A}'..='\u{2E3B}'
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| '\u{2E40}'
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| '\u{2E5D}'
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| '\u{301C}'
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| '\u{3030}'
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| '\u{30A0}'
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| '\u{FE31}'..='\u{FE32}'
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| '\u{FE58}'
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| '\u{FE63}'
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| '\u{FF0D}'
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| '\u{10D6E}'
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| '\u{10EAD}'
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// NFKC '.', '/', '_' (UnicodeData.txt decompositions).
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| '\u{2024}'
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| '\u{FE52}'
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| '\u{FF0E}'
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| '\u{FF0F}'
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| '\u{FE33}'..='\u{FE34}'
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| '\u{FE4D}'..='\u{FE4F}'
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| '\u{FF3F}'
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),
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}
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}
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/// Whether `c` is invisible, so a TIN's digits read as neighbors across it
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/// however many there are (`1\u{200B}2` shows as `12`): Unicode's
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/// Default_Ignorable_Code_Point (DerivedCoreProperties.txt, 17.0): the
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/// soft hyphen, the zero-width space and joiners, the left-to-right and
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/// right-to-left marks and the other directional formatting characters,
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/// the word joiner, the byte-order mark, the variation selectors, the tags
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/// and the fillers. None is ASCII.
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fn tin_invisible(c: char) -> bool {
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matches!(
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c,
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' ' | '-'
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| '.'
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| '/'
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| '_'
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| '\u{a0}'
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| '\u{2010}'
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| '\u{2011}'
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| '\u{2012}'
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| '\u{2013}'
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| '\u{2014}'
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| '\u{2212}'
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'\u{AD}'
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| '\u{34F}'
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| '\u{61C}'
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| '\u{115F}'..='\u{1160}'
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| '\u{17B4}'..='\u{17B5}'
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| '\u{180B}'..='\u{180F}'
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| '\u{200B}'..='\u{200F}'
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| '\u{202A}'..='\u{202E}'
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| '\u{2060}'..='\u{206F}'
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| '\u{3164}'
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| '\u{FE00}'..='\u{FE0F}'
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| '\u{FEFF}'
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| '\u{FFA0}'
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| '\u{FFF0}'..='\u{FFF8}'
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| '\u{1BCA0}'..='\u{1BCA3}'
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| '\u{1D173}'..='\u{1D17A}'
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| '\u{E0000}'..='\u{E0FFF}'
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)
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}
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/// The most separators that may sit between two of a TIN's digits
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/// (`" - "` is three).
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/// (`" - "` is three); invisible characters ([`tin_invisible`]) don't
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/// count.
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const MAX_TIN_GAP: usize = 3;
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/// Each run in `chars` that holds nine digits or more, as (first, last)
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/// char indices of its digits: digits with at most [`MAX_TIN_GAP`]
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/// separators ([`tin_separator`]) between neighbors.
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/// separators ([`tin_separator`]) between neighbors, and any number of
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/// invisible characters.
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fn full_tin_runs(chars: &[char]) -> Vec<(usize, usize)> {
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let mut runs = Vec::new();
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let mut i = 0;
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@@ -315,11 +384,19 @@ fn full_tin_runs(chars: &[char]) -> Vec<(usize, usize)> {
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j += 1;
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continue;
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}
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let gap = chars[j..].iter().take_while(|c| tin_separator(**c)).count();
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if (1..=MAX_TIN_GAP).contains(&gap)
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&& chars.get(j + gap).is_some_and(|c| c.is_numeric())
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let between = chars[j..]
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.iter()
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.take_while(|c| tin_separator(**c) || tin_invisible(**c))
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.count();
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let gap = chars[j..j + between]
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.iter()
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.filter(|c| !tin_invisible(**c))
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.count();
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if between > 0
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&& gap <= MAX_TIN_GAP
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&& chars.get(j + between).is_some_and(|c| c.is_numeric())
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{
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j += gap;
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j += between;
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} else {
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break;
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}
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@@ -333,11 +410,13 @@ fn full_tin_runs(chars: &[char]) -> Vec<(usize, usize)> {
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}
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/// Whether `text` holds a run of nine digits, with at most three
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/// separators (space, hyphen, dot, slash, underscore, a Unicode dash or
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/// no-break space) between neighbors: an SSN, EIN, or ITIN however it's
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/// written (`291-12-2846`, `291.12.2846`, `291 - 12 - 2846`). Any Unicode
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/// numeral counts as a digit (full-width, Arabic-Indic, ...), so a number
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/// can't slip through in another script.
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/// separators (a space, hyphen, dot, slash or underscore, in any of
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/// their Unicode forms) between neighbors, invisible
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/// characters not counted: an SSN, EIN, or ITIN however it's written
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/// (`291-12-2846`, `291.12.2846`, `291 - 12 - 2846`, `２９１－１２－２８４６`).
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/// Any Unicode numeral counts as a digit (full-width, Arabic-Indic, ...),
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/// so a number can't slip through in another script. In ASCII, exactly
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/// the space, hyphen, dot, slash and underscore separate.
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pub fn has_full_tin(text: &str) -> bool {
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let chars: Vec<char> = text.chars().collect();
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!full_tin_runs(&chars).is_empty()
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