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checkout-service · main

src/
  billing/
    Invoice.kt
    Tax.kt
  checkout/
    Cart.kt
test/
build.gradle.kts

class Invoice(val lines: List<Line>) { // rounding happens per line fun total(): Money = lines.sumOf { it.net.round() } fun tax(rate: Rate) = total() * rate }

pi Each line is rounded before the sum, so the total can be off by up to 0.5¢ per line. See Invoice.kt:4 and the fix in diff: Invoice.kt.read Invoice.kt, Tax.kt · 2 tool calls

1 Invoice.kt:3–4 · “why per line?”2 screenshot · checkout total› can we round once at the end?

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pi · checkout-serviceEach line is rounded before the sum.

1 Round once at the end instead?

Editor

Invoice.ktlines.sumOf { it.net.round() }

2 Why per line?

Diff viewer

Invoice.kt · HEAD vs working tree+ lines.sumOf { it.net }.round()

3 Keep half-up rounding here

Project View

src/billingInvoice.kt Tax.kt Rate.kt

4 Tax uses the same rule, check it too

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docs/billing.mdTotals are rounded per invoice line.

5 This doc is out of date

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screenshot · checkoutTotal $41.99 Expected $42.00

6 This is the bug

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pi · checkout-service

pi Each line is rounded before the sum, so the total can be off by up to 0.5¢ per line.

The sum is in , and tax reuses it in .

I rounded once at the end. See the change in .

▸ edit Invoice.kt · +2 −1 · ▸ run tests · 48 passed

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› why is the total off by a cent?

$ rg -n "round\(" src

src/billing/Invoice.kt:4: fun total(): Money = lines.sumOf { it.net.round() }

src/billing/Tax.kt:12: invoice.total() * rate

read src/billing/Invoice.kt (1-40)

read src/billing/Tax.kt (1-25)

$ ./gradlew :test --tests 'InvoiceTest'

> Task :compileKotlin

> Task :test

InvoiceTest > rounds once at the end PASSED

BUILD SUCCESSFUL in 6s

pi Each line was rounded before the sum. I rounded once at the end; tests pass.

JetPi

› why is the total off by a cent?

▸ 4 tool calls · rg, read Invoice.kt, read Tax.kt, gradle test

pi Each line was rounded before the sum. I rounded once at the end; tests pass.

Copy MarkdownFork from here

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▾ pi · checkout-service
   ├ pi · review Tax.kt      working
   └ claude · write tests   ready

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claude → codex   review Invoice.kt
codex  ✓ received
codex → claude   2 notes, see diff

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fun total(): Money = lines.sumOf { it.net } .round() // once val label = "Total"

pi Rounding now happens once, in total(). ▸ edit Invoice.kt · +2 −1 ▸ run tests · 48 passed

IDE themejetIDEAI editor schemePi themeTerminal colors

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