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 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.
Against 1 clip.js:49 in readClip CivilCraft
```
if (!obj || typeof obj !== 'object' || obj.format !== CLIP_FORMAT || obj.v !== 1 || !Array.isArray(obj.pts)) return null;
```
!== in obj.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 dwg/objects-write.js:658 in insertScale 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/objects-write.js:658 in insertScale 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/objects-write.js:658 in insertScale 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/objects-write.js:660 in insertScale 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 dwg/objects-write.js:774 DetailCraft, PartCraft
```
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. Not in the register.
Against 1 dwg/objects-write.js:818 DetailCraft, PartCraft
```
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. Not in the register.
Against 1 lib-supply/supply.js:115 in readSupply DetailCraft
```
if (!json || typeof json !== 'object' || json.v !== 1) return null;
```
!== in json.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Supplier stock and lead-time check.

Against 1 base-ui.js:580 in scaleFor MarkupCraft

if (keep) { const s = Math.max(Math.abs(sx === 1 && !grip.key.match(/[ew]/) ? sy : sx), Math.abs(sy === 1 && !grip.key.match(/[ns]/) ? sx : sy)); sx = Math.sign(sx) * s; sy = Math.sign(sy) * s; }

=== 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 base-ui.js:580 in scaleFor MarkupCraft

if (keep) { const s = Math.max(Math.abs(sx === 1 && !grip.key.match(/[ew]/) ? sy : sx), Math.abs(sy === 1 && !grip.key.match(/[ns]/) ? sx : sy)); sx = Math.sign(sx) * s; sy = Math.sign(sy) * s; }

=== 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 clip.js:82 in cleanClip MarkupCraft
```
if (!d || typeof d !== 'object' || d.format !== CLIP_FORMAT || d.v !== 1 || !Array.isArray(d.items)) 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: Area markup with cut-outs, and clipboard placement.
Against 1 content-clip.js:86 in cleanContentClip MarkupCraft
```
if (!d || typeof d !== 'object' || d.format !== CONTENT_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: Carried, stamped and pasted markup geometry.
Against 1 markupcraft.js:4498 in recover MarkupCraft
```
if (!rec.data?.pdf || !st || st.v !== 1) throw new Error(t('recover.bad'));
```
!== in st.v !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Sheet scale, typed lengths and measured values, Markup geometry while drawing and editing, Drawing comparison by vector paths.
Against 1 pdf-read.js:146 in fromPrivate MarkupCraft
```
if (!d || typeof d !== 'object' || d.v !== 1 || typeof d.type !== 'string' || !TYPES[d.type] || d.type === 'foreign') 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: Annotations and scales read from a PDF.
Against 1 records.js:156 in unpackRecords MarkupCraft
```
if (!v || typeof v !== 'object' || v.v !== 1 || !Array.isArray(v.records)) return [];
```
!== in v.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 mesh/ops.js:773 in splitByPoints ModelCraft
```
if (inSplit.has(f) && on.length === 2 && Math.abs(on[0] - on[1]) !== 1 && Math.abs(on[0] - on[1]) !== vs.length - 1) {
```
!== in Math.abs(on[0] - on[1]) !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Proportional editing weights and edge creases, Inset, bevel and moves along normals, Subdivide, loop cut, bisect, knife and grid fill, Merge, spin, bridge, slide and smooth.
Against 1 model-info.js:58 in cleanTemplate ModelCraft
```
if (!v || typeof v !== 'object' || v.v !== 1) return null;
```
!== in v.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 nurbs/step.js:302 in trimOf ModelCraft, PartCraft
```
let seg = c.deg === 1 ? c.cvs.slice() : Array.from({ length: 33 }, (_, i) => C.point(c, a + (z - a) * i / 32));
```
=== in c.deg === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: STEP files of NURBS curves and surfaces.
Against 1 skp/messages.js:160 in msg ModelCraft
```
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 bodies-ui.js:225 in panel PartCraft

grid.push(host.check(t('ui.bodies.scale.uniform'), f.uniform, (v) => set(f, t('ui.bodies.undo.uniform'), (g) => { g.uniform = v; if (!v && g.sx === 1 && g.sy === 1 && g.sz === 1) { g.sx = g.s; g.sy =

=== in g.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 bodies-ui.js:225 in panel PartCraft

grid.push(host.check(t('ui.bodies.scale.uniform'), f.uniform, (v) => set(f, t('ui.bodies.undo.uniform'), (g) => { g.uniform = v; if (!v && g.sx === 1 && g.sy === 1 && g.sz === 1) { g.sx = g.s; g.sy =

=== in g.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 bodies-ui.js:225 in panel PartCraft

grid.push(host.check(t('ui.bodies.scale.uniform'), f.uniform, (v) => set(f, t('ui.bodies.undo.uniform'), (g) => { g.uniform = v; if (!v && g.sx === 1 && g.sy === 1 && g.sz === 1) { g.sx = g.s; g.sy =

=== in g.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.