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 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.

Against 1 flow-study.js:82 in readFlow PartCraft
```
if (typeof raw !== 'object' || Array.isArray(raw) || raw.v !== 1) bad(t('study.flow.err.bad_study'));
```
!== 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. Reviewed: Flow study: fluid cells, openings and wall distances, Flow study: 32-bit steps in the mesh and the result fields.
Against 1 sim.js:80 in readSimStudy PartCraft
```
if (!raw || typeof raw !== 'object' || Array.isArray(raw) || raw.v !== 1) bad(t('study.sim.err.bad_study'));
```
!== 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. Reviewed: Study set-up: element size and the mesh handed to the solver.
Against 1 sim.js:97 in readGenStudy PartCraft
```
if (!raw || typeof raw !== 'object' || Array.isArray(raw) || raw.v !== 1) bad(t('study.sim.err.bad_gen'));
```
!== 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. Reviewed: Study set-up: element size and the mesh handed to the solver.
Against 1 swmacro.js:1569 in partToSwb PartCraft
```
if (info.factor !== 1) rhs = `(${rhs}) * ${formatNumber(info.factor)}`;
```
!== in info.factor !== 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Numbers written into the VBA macro export.
Against 1 assets/js/addon-license.js:50 in verifyEntitlement Shared shell, every app
```
if (!payload || payload.v !== 1 || !Number.isFinite(payload.exp)) return { ok: false, reason: 'bad-signature' };
```
!== in payload.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 assets/js/calc.js:240 in dimText Shared shell, every app
```
d.forEach((x, i) => { if (Math.abs(x) < 1e-9) return; const s = BASE_NAMES[i] + (Math.abs(x) === 1 ? '' : '^' + sig(Math.abs(x), 3)); (x > 0 ? top : bot).push(s); });
```
=== in Math.abs(x) === 1. Fine for a value that is set, not computed (a default scale). If it comes from a calculation, use an epsilon. Reviewed: Calc sheets, Calc sheet units, functions and driven parameters.
Against 1 assets/js/live-crypto.js:329 in verifyAssertion Shared shell, every app
```
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 carbon.js:32 in readCarbon TakeoffCraft
```
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: Embodied carbon from quantities, Rates exported as a price table.
Against 1 prices.js:31 in readStore TakeoffCraft
```
if (!json || typeof json !== 'object' || json.v !== 1) return s;
```
!== 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. Not in the register.
Against 1 supply.js:99 in readSupply TakeoffCraft
```
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.