Resources Numerical accuracy

Equality comparisons

Where the code asks whether two decimal numbers are exactly equal. A floating-point result can differ from another in the last digit after a few transformations, so a mesh run through several of them can change the length of an edge, or miss a match. Compare with < or > where a range is meant, and with a documented epsilon where equality is.

316 comparisons to look at
149 files
175 likely to matter (against a decimal, or two computed values)
Scanned November 6, 2026

These are places worth checking, not confirmed bugs. The scan reads how the code is written, not what it is meant to do, so some entries are fine as they are: a test against exactly 0 is often a deliberate guard against dividing by zero. It skips text, counts and indexes, and any comparison it cannot be sure involves decimal numbers, so there are likely more in the code than are listed here.

Against 1 addons/apparel/lib/text.js:24 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;   // plurals (English rules)
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/cabinet/lib/core.js:17 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/cabinetcraft/lib/core.js:17 in lookupFrom CadCraft, BimCraft, ModelCraft, PartCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/harness/lib/core.js:17 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/hvac/lib/mep-core.js:29 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/lighting/lib/core.js:17 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/objects.js:98 in identity CadCraft
```
const identity = (e) => !(e.x || e.y || e.rot) && (e.sx ?? 1) === 1 && (e.sy ?? 1) === 1;
```
=== in (e.sx ?? 1) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/objects.js:98 in identity CadCraft
```
const identity = (e) => !(e.x || e.y || e.rot) && (e.sx ?? 1) === 1 && (e.sy ?? 1) === 1;
```
=== in (e.sy ?? 1) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/pid/lib/core.js:23 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: P&ID line geometry and connections.
Against 1 addons/piping/lib/mep-core.js:29 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Pipe runs: layout, 3D solid and schedule.
Against 1 addons/trusscraft/lib/core.js:12 in lookupFrom CadCraft, BimCraft, ModelCraft, PartCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 addons/windows/lib/core.js:17 in lookupFrom CadCraft
```
if (s && typeof s === 'object') s = (vars.n !== undefined && s['=' + vars.n]) || (Number(vars.n) === 1 && s.one) || s.other || key;
```
=== in Number(vars.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 areaclip.js:75 in cleanAreaClip CadCraft, BimCraft, MarkupCraft, DetailCraft
```
if (!d || typeof d !== 'object' || d.format !== AREA_FORMAT || d.v !== 1) return null;
```
!== in d.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Size of a copied area.
Against 1 commands.js:3332 in insertFromFile CadCraft
```
return { name: r.name, scale: plan.scale !== 1 ? plan.scale : null };
```
!== in plan.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Typed points, distances and angles, Shapes made by the draw commands, Move, rotate, scale, mirror, array, stretch and lengthen, Distance, area, angle and point inquiries, Where dimensions are attached, User coordinate system set by command, Viewports on a sheet.
Against 1 dwg/messages.js:188 in msg CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sy === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:658 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sz === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:660 in insertScale CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
else if (sx === 1) { w.BB(1); w.DD(sy, 1); w.DD(sz, 1); }
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:774 CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
const weights = ctrl.some((p) => p.w !== undefined && p.w !== 1) || (r.weights || []).some((x) => x !== 1);
```
!== in p.w !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/objects-write.js:818 CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft
```
const rational = ctl.some((p) => p.w !== undefined && p.w !== 1);
```
!== in p.w !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DWG object values written and read.
Against 1 dwg/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dwg/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sy === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dwg/table-write.js:70 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
if (sx === 1 && sy === 1 && sz === 1) w.BB(3);
```
=== in sz === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dwg/table-write.js:72 in insertScale CadCraft, ModelCraft, CivilCraft, DetailCraft, PartCraft
```
else if (sx === 1) { w.BB(1); w.DD(sy, 1); w.DD(sz, 1); }
```
=== in sx === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 dxf-model.js:58 in msg CadCraft, BimCraft, TakeoffCraft, CivilCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading into the shared drawing model.
Against 1 dxf.js:177 in readHeader CadCraft
```
else if (varName === '$LTSCALE' && c === 40 && parseFloat(v) > 0 && parseFloat(v) !== 1) out.meta.ltscale = parseFloat(v);
```
!== in parseFloat(v) !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading: objects from the file's text, DXF writing: numbers as text.
Against 1 dxf.js:659 in entityFrom CadCraft
```
const sz = num(g, 43, 1); if (sz && sz !== 1) add.sz = sz;
```
!== in sz !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading: objects from the file's text, DXF writing: numbers as text.
Against 1 dxf.js:1507 in entity CadCraft
```
if ((e.sx ?? 1) !== 1) w(41, f(e.sx)); if ((e.sy ?? 1) !== 1) w(42, f(e.sy)); if (Number.isFinite(e.sz) && e.sz && e.sz !== 1) w(43, f(e.sz)); if (e.rot) w(50, f(deg(e.rot)));
```
!== in (e.sx ?? 1) !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading: objects from the file's text, DXF writing: numbers as text.
Against 1 dxf.js:1507 in entity CadCraft
```
if ((e.sx ?? 1) !== 1) w(41, f(e.sx)); if ((e.sy ?? 1) !== 1) w(42, f(e.sy)); if (Number.isFinite(e.sz) && e.sz && e.sz !== 1) w(43, f(e.sz)); if (e.rot) w(50, f(deg(e.rot)));
```
!== in (e.sy ?? 1) !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: DXF reading: objects from the file's text, DXF writing: numbers as text.
Against 1 libitem.js:233 in msg CadCraft, BimCraft
```
if (typeof s === 'object') s = s['=' + fills.n] ?? (Number(fills.n) === 1 ? s.one : s.other) ?? s.other;
```
=== in Number(fills.n) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Library item geometry from blocks, meshes and tables, Lengths and units for Library items.
Against 1 libitem.js:1465 in drawingUnits CadCraft, BimCraft
```
const metric = Number(db.header?.MEASUREMENT) === 1;
```
=== in Number(db.header?.MEASUREMENT) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Library item geometry from blocks, meshes and tables, Lengths and units for Library items.
Against 1 libpanel.js:194 in search CadCraft
```
sayAfterEnd(r.total ? r.total + ' item' + (r.total === 1 ? '' : 's') + (r.total > cards.length ? ', showing ' + cards.length : '') + '.' : t('lib.panel.nothing_found'));
```
=== in r.total === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 live-crypto.js:329 in verifyAssertion CadCraft, BimCraft, ModelCraft, MarkupCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (!sig || !claims || claims.v !== 1 || typeof claims.name !== 'string') return { ok: false, reason: 'format' };
```
!== in claims.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/env/cheminfo.js:182 in groupsOf CadCraft, BimCraft
```
if (arom) inc(a.h === 1 ? 'ring =CH-' : a.h === 0 ? 'ring =C<' : 'ring =CH-');
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:184 in groupsOf CadCraft, BimCraft
```
else if (dbl) { if (nb[i].some((x) => x.order === 2 && mol.atoms[x.o].el !== 'C')) missing.push('carbonyl or C=X carbon'); else if (inRing[i]) missing.push('ring alkene carbon'); else if (dbl === 1 &&
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:185 in groupsOf CadCraft, BimCraft
```
else if (inRing[i]) { if (a.h === 2) inc('ring CH2'); else if (a.h === 1) inc('ring CH'); else missing.push('ring quaternary carbon'); }
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/cheminfo.js:188 in groupsOf CadCraft, BimCraft
```
if (a.h === 1 && nb[i].length === 1 && !mol.atoms[nb[i][0].o].aromatic) inc('-OH (alcohol)');
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Molar mass and group-contribution estimates.
Against 1 process/env/molsketch.js:85 in symbol CadCraft, BimCraft
```
return '[' + el + (a.h ? (a.h === 1 ? 'H' : 'H' + a.h) : '') + (q ? (q > 0 ? '+' + (q > 1 ? q : '') : '-' + (q < -1 ? -q : '')) : '') + ']';
```
=== in a.h === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/live.js:37 in readPacket CadCraft, BimCraft
```
if (!raw || typeof raw !== 'object' || raw.format !== FORMAT || raw.v !== 1) return null;
```
!== in raw.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 process/safety/hazoptimer.js:57 in restore CadCraft, BimCraft
```
if (!s || s.v !== 1 || !Array.isArray(s.rows)) return false;
```
!== in s.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Not in the register.
Against 1 redline.js:46 in readRedline CadCraft
```
if (o.v !== 1) return { ok: false, pkg: null, errors: ['version'] };
```
!== in o.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Redline items placed in the drawing.
Against 1 usd/usda-write.js:40 in subLayersText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
return asset(a) + (o && (o.offset !== 0 || o.scale !== 1) ? ' (' + layerOffsetText(o) + ')' : '');
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.
Against 1 usd/usda-write.js:47 in layerOffsetText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (o.scale !== 1) parts.push('scale = ' + num(o.scale, 'f64'));
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.
Against 1 usd/usda-write.js:172 in listItemText CadCraft, BimCraft, ModelCraft, TakeoffCraft, CivilCraft, DetailCraft, PartCraft
```
if (o && (o.offset !== 0 || o.scale !== 1)) parts.push(layerOffsetText(o));
```
!== in o.scale !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Number text in USD files.