Beispiel

Configure YAML decoding with yaml.AllowDuplicateMapKey to permit duplicate mapping keys and retain the latest value instead of failing with a syntax error

sha256:5dac961373b18c0b0dbf6de249512818668244b0f0d0efae8f309c2f73f303de

Fall

Ziel

Configure YAML decoding with yaml.AllowDuplicateMapKey to permit duplicate mapping keys and retain the latest value instead of failing with a syntax error HOW

Pakete

github.com/goccy/go-yaml v1.19.2

Umgebung

go

Erstellt

2026-08-17T14:04:27Z

Häufige Annahme

yaml.Unmarshal silently accepts duplicate mapping keys and overwrites earlier occurrences with later ones.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• assert yaml.Unmarshal rejects duplicate mapping keys with a SyntaxError by default, leaving destination values empty
• assert yaml.UnmarshalWithOptions with yaml.AllowDuplicateMapKey succeeds and retains the latest key value in document order
• assert yaml.NewDecoder with yaml.AllowDuplicateMapKey succeeds on streaming readers with duplicate mapping keys
• assert yaml.AllowDuplicateMapKey applies identically to nested struct fields and map targets

Dateien

• NOTES.md
• csx.json
• go.mod
• go.sum
• yaml_duplicate_key_test.go

Quellartefakt herunterladen (tar.gz)

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9