Sample

Acknowledge that IterableExtension.sample before 1.19.0 retains the original sequence when count equals length.

sha256:c6c2b720e913c47eb8f6dddaa97094bb03800d936bdc2c9f292cdcffd7d37401

Case

Goal

Acknowledge that IterableExtension.sample before 1.19.0 retains the original sequence when count equals length. HOW

Packages

collection 1.18.0

Environment

dart

Created

2026-08-17T02:51:44Z

Commonly assumed

IterableExtension.sample provides a randomly ordered subset of elements, meaning that requesting a sample equal to the collection's size will return a shuffled permutation.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

Contract

• Before 1.19.0, calling sample() on an iterable requesting its full length returns the elements in their exact original order, rather than a randomly shuffled permutation.
• if ([1, 2, 3, 4, 5].sample(5).toString() != '[1, 2, 3, 4, 5]') throw Exception('Failed');

Files

• NOTES.md
• csx.json
• pubspec.lock
• pubspec.yaml
• test/contract.dart

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

• dart 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17 · ed25519:d91480838ac982c9