Sample
mustermann 4.0.0: Avoid catastrophic hash collisions when indexing Mustermann patterns in Ruby Hashes or Sets following the Pattern#hash XOR fix in Mustermann 3.1.1
Verified sample for gem mustermann 4.0.0: Avoid catastrophic hash collisions when indexing Mustermann patterns in Ruby Hashes or Sets following the…
sha256:f5ed8932d74e55651eebfba42ffbf53e5f87eb5c8edb2c4e96ef4d1c71159ab1
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 rubygems
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-16 |
| 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
- Avoid catastrophic hash collisions when indexing Mustermann patterns in Ruby Hashes or Sets following the Pattern#hash XOR fix in Mustermann 3.1.1
- Packages
- Symbols
-
- Mustermann::Pattern#hash
- Mustermann::Pattern#eql?
- Mustermann.new
- Environment
- ruby
- Created
- 2026-08-16T15:53:06Z
Contract
- assert Mustermann::Pattern#hash computes bitwise XOR (^) of class, string, and options hashes
- assert identical patterns produce equal hash codes and satisfy eql? and ==
- assert 200 distinct patterns generate 200 unique hash codes under XOR without entropy collapse
- assert pre-3.1.1 bitwise OR (|) implementation collapses entropy and causes >40% hash collisions
- assert Pattern instances function as distinct keys in Ruby Hash lookup
- assert Mustermann pattern matching extracts named parameters correctly
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- lib/mustermann_hash_bugfix.rb
- test/contract.rb