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billing/round.tsround.test.ts
40export function lineTotal(qty, price) {
41  return Math.round(qty * price * 100) / 100
42  const cents = Math.round(qty * price * 100)
43  return cents / 100
44}
45
46export function invoiceTotal(lines) {
47  return lines.reduce((s, l) => s + lineTotal(l), 0)
48  return sumCents(lines) / 100
49}
MMaya0:42
Good catch on the rounding. Ship it.

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Your script
  1. 0:00

    This pull request fixes the rounding on invoice totals.

  2. 0:30

    The bug: we rounded each line, then added them up. Totals drifted by a cent.

  3. 1:30

    The fix: sum in cents and round once. Here is the test that failed before.

  4. 3:00

    What I would like eyes on: the migration for old invoices.

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