golang.org/x/text seems to fit FormatUSD requirement and is also pretty cool

todo.yaml

@@ -22,6 +22,27 @@ todo:
         arabic      => non-digits
         azerbaijan  => xxx.yyy,zz
         hindi       => ww,xx,yyy.zz
+
+        https://dev.to/theodesp/a-step-by-step-guide-to-go-internationalization-i18n--localization-l10n-4ig2
+        solved problem?
+        * golang.org/x/text
+          p := message.NewPrinter(language.BritishEnglish)
+          p.Printf("There are %v flowers in our garden.", 1500)
+          language.Greek, language.BrazilianPortuguese
+          language.Make("el"), language.Parse("en-UK")
+          ja, _ := language.ParseBase("ja")

+          jp, _ := language.ParseRegion("JP")

+          jpLngTag, _ := language.Compose(ja, jp)

+          fmt.Println(jpLngTag) // prints ja-JP
+        * reminds me of language of like C_LANG env variable I've seen...
+        * neato all under golang.org/x/text
+          p := message.NewPrinter(language.English)
+          p.Printf("%d", currency.Symbol(currency.USD.Amount(0.1)))
+          fmt.Println()
+          p.Printf("%d", currency.NarrowSymbol(currency.JPY.Amount(1.6)))
+          fmt.Println()
+          p.Printf("%d", currency.ISO.Kind(currency.Cash)(currency.EUR.Amount(12.255)))
+          fmt.Println()
   - TestTransaction_String
   - TestTransaction_String/MCCOLLOMS_INC
   - TestTransaction_String/QUANTUM_ELECTRIC_INC
@@ -176,3 +197,37 @@ done:
   - TestAnalyzer_TransactionsFromURLs
   - TestAnalyzer_TransactionsFromURLsConcurrent
   ts: Sun Oct 15 10:54:35 MDT 2023
+- todo: go test
+  subtasks:
+  - my `go mod tidy` actually cleared `go.mod` file, probably weird localhost backwards
+    compatilble stuff
+  - todo: TestFormatUSD
+    subtasks:
+    - TestFormatUSD/zero
+    - TestFormatUSD/positive
+    - TestFormatUSD/negative
+    - TestFormatUSD/large
+    - no implementation
+    - naive `-$xx,yyy.zz`
+    - todo: comment emphasizes localization, which is minimum `-<always $>xx.yyy,zz`
+      details: |
+        BUT no indicator of what is "local". Could use system timezone/location stuff but that's weird.
+
+        https://phrase.com/blog/posts/number-localization/
+        english     => xxx,yyy.zz
+        french      => xxx yyy.zz
+        arabic      => non-digits
+        azerbaijan  => xxx.yyy,zz
+        hindi       => ww,xx,yyy.zz
+  - TestTransaction_String
+  - TestTransaction_String/MCCOLLOMS_INC
+  - TestTransaction_String/QUANTUM_ELECTRIC_INC
+  - TestTransaction_String/MARRIOTT_33716_NEW_ORLEAN
+  - TestAnalyzer_TransctionsSum
+  - TestAnalyzer_LargestTransaction
+  - TestAnalyzer_DuplicatesExcluded
+  - TestAnalyzer_GroupByCategory
+  - TestAnalyzer_BigSpendersReport
+  - TestAnalyzer_TransactionsFromURLs
+  - TestAnalyzer_TransactionsFromURLsConcurrent
+  ts: Sun Oct 15 10:57:33 MDT 2023