Beispiel

Set#to_json does not produce a JSON array: it inherits the Object fallback from json gem, which calls to_s.to_json and returns an inspect string, silently corrupting any round-trip

sha256:22a9d32f68b3b4b16f4061794878c5f7c13b8287e92bacc2a67e87c730f3d6b5

Fall

Ziel

Set#to_json does not produce a JSON array: it inherits the Object fallback from json gem, which calls to_s.to_json and returns an inspect string, silently corrupting any round-trip HOW

Pakete

set 1.1.1 json 2.9.1

Umgebung

ruby

Erstellt

2026-08-17T02:47:04Z

Häufige Annahme

Set[1,2,3].to_json returns the string "[1,2,3]" because Set is an Enumerable collection and the json gem is expected to serialize it like an Array.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• Set[1,2,3].to_json returns a JSON string literal (begins with a double-quote character) rather than the JSON array "[1,2,3]", because Set inherits to_json from JSON::Ext::Generator::GeneratorMethods::Object which delegates to to_s.to_json
• JSON.parse(Set[1,2,3].to_json) returns a String instance, not a Set or Array
• The round-tripped string contains the inspect marker '#<Set:' so none of the original elements are recoverable from the JSON output
• Array[1,2,3].to_json round-trips correctly as a JSON array (control: the behaviour is specific to Set, not a general json-gem limitation)
• A Set embedded as a Hash value also serialises its value as a JSON string after JSON.parse

Dateien

• Gemfile
• Gemfile.lock
• NOTES.md
• csx.json
• test/contract.rb

Verifiziertes Artefakt herunterladen (tar.gz) — genau die Bytes, gegen die der Contract lief

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

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