Sample
serde_json 1.0.150: Preserving JSON object key insertion order in serde_json Value and Map requires the cargo feature preserve_order backed by IndexMap instead of default BTreeMap sorting
Verified sample for cargo serde_json 1.0.150: Preserving JSON object key insertion order in serde_json Value and Map requires the cargo feature…
sha256:bc905574d834dc81fb6f8910ad89a148a8ab9c4ead1e0ed5990eac38e150f882
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
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-16 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Preserving JSON object key insertion order in serde_json Value and Map requires the cargo feature preserve_order backed by IndexMap instead of default BTreeMap sorting
- Packages
- Symbols
-
- serde_json::Map
- serde_json::Value
- serde_json::from_str
- serde_json::to_string
- serde_json::json
- Environment
- rust
- Created
- 2026-08-16T06:27:36Z
Contract
- assert serde_json from_str preserves source object key insertion order in Value and Map with preserve_order feature
- assert serde_json to_string serializes Value objects with original insertion order rather than sorted keys
- assert serde_json Map insert appends new key-value pairs to the iteration order rather than sorting lexicographically
- assert serde_json json macro preserves key declaration order in constructed Value objects
Files
- .gitignore
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs