Sample
github.com/goccy/go-yaml v1.19.2: Configure YAML decoding with yaml.AllowDuplicateMapKey to permit duplicate mapping keys and retain the latest value instead of failing with a syntax error
Verified sample for golang github.com/goccy/go-yaml v1.19.2: Configure YAML decoding with yaml.AllowDuplicateMapKey to permit duplicate mapping keys and…
sha256:5dac961373b18c0b0dbf6de249512818668244b0f0d0efae8f309c2f73f303de
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
go linux x64 go go go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-17 |
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-18 |
Case
HOW- Goal
- Configure YAML decoding with yaml.AllowDuplicateMapKey to permit duplicate mapping keys and retain the latest value instead of failing with a syntax error
- Packages
- Symbols
-
- yaml.AllowDuplicateMapKey
- yaml.Unmarshal
- yaml.UnmarshalWithOptions
- yaml.NewDecoder
- Environment
- go
- Created
- 2026-08-17T14:04:27Z
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
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- yaml_duplicate_key_test.go