Sample
Show that unknown fields are accepted by default when using `sigs.k8s.io/yaml.Unmarshal`
sha256:31bb1662a7e52a6917ae49a60054435cf7896f3677ef04c2dbd3e0e314827ca5
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Show that unknown fields are accepted by default when using `sigs.k8s.io/yaml.Unmarshal` HOW
- Packages
- sigs.k8s.io/yaml v1.4.0
- Environment
- go
- Created
- 2026-08-16T13:18:55Z
Commonly assumed
A caller expects unknown YAML keys to be rejected by default when decoding into a typed struct.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- assert Unmarshal succeeds when decoding `name: main unknown: value` into `decodeTarget` without options
- assert the known `name` field decodes to `main` when unknown fields are present
- assert adding `yaml.DisallowUnknownFields` as the JSON option makes the same input fail
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- unknown_field_default_test.go
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- go 1.26 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-16 · ed25519:d91480838ac982c9