Sample
json 2.9.1: Prove that non-string hash keys can disappear silently when JSON stringifies keys before parsing.
Verified sample for gem json 2.9.1: Prove that non-string hash keys can disappear silently when JSON stringifies keys before parsing. The contract ran on…
sha256:ba97e97ecda15df826536164d19fb790db2821d0d91ae3dfb2f344205cfb43a0
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
ruby linux x64 ruby ruby bundler
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-17 |
| ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Prove that non-string hash keys can disappear silently when JSON stringifies keys before parsing.
- Packages
- Symbols
-
- JSON.generate
- JSON.parse
- Environment
- ruby
- Created
- 2026-08-17T01:17:10Z
Contract
- JSON.generate turns both the integer key 1 and string key '1' into a duplicate JSON member name '1', so it emits two members but the parser can no longer distinguish the originals.
- JSON.parse(JSON.generate({1=>"num", "1"=>"str"})) returns {"1"=>"str"} because the second duplicate wins.
- JSON.parse(JSON.generate({1=>"num", "1"=>"str"}), symbolize_names: true) returns {"1":"str"} and still exposes only one key.
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb