Sample
set 1.1.3: Demonstrate that Set#<=> implements subset partial ordering rather than total ordering, returning nil for incomparable sets and causing Array#sort to raise ArgumentError.
Verified sample for gem set 1.1.3: Demonstrate that Set#<=> implements subset partial ordering rather than total ordering, returning nil for incomparable…
sha256:72cc01c64895659755d1fa04f846f49f48adf91a79aee92dd664dde5076fe8ed
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
- Demonstrate that Set#<=> implements subset partial ordering rather than total ordering, returning nil for incomparable sets and causing Array#sort to raise ArgumentError.
- Packages
- Symbols
-
- set
- Set
- Set#<=>
- Environment
- ruby
- Created
- 2026-08-17T07:23:19Z
Contract
- Set#<=> returns nil when neither set is a subset of the other, which causes Array#sort on incomparable sets to raise ArgumentError.
- Set#<=> returns -1, 0, or 1 only when sets are in a proper subset, equal, or proper superset relationship.
- Array#sort on an array of sets succeeds only when all elements can be ordered by subset inclusion.
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb