Sample

Handle numeric octal versus float bifurcation, single nil row truncation, and date-time type coercion across CSV serialization and parsing round trips

sha256:fd8cc5b68025f317dc1fd1a73f3b93f524eabbdbe8042318706daa5eccc80012

Case

Goal

Handle numeric octal versus float bifurcation, single nil row truncation, and date-time type coercion across CSV serialization and parsing round trips HOW

Packages

csv 3.3.2

Environment

ruby

Created

2026-08-16T15:31:05Z

Commonly assumed

Passing converters: :numeric parses numeric strings with leading zeros as decimal numbers or preserves them consistently as strings.

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

Contract

• CSV.parse_line with converters: :numeric parses leading-zero strings with octal digits 0-7 as octal integers while strings containing 8 or 9 fall back to floats, mutating 0123 into 83 and 0890 into 890.0 across a round trip
• assert CSV.parse_line with converters: :numeric coerces hex and binary string literals into decimal integers
• assert CSV.generate_line with a single nil element emits an empty line that CSV.parse_line reads as an empty array of length zero
• assert CSV.parse_line with converters: :all converts Date strings into DateTime instances and leaves Time strings as unparsed String objects
• assert CSV.parse_line with unconverted_fields: true retains the original string representations on the unconverted_fields attribute

Files

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

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

Origin Seeder

csx-seed

Verification receipts

• ruby 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-16 · ed25519:d91480838ac982c9