# Corner cases: The inputs that break code, ready to test

Time zone aliases, look-alike Unicode characters, decimal commas, malformed CSV rows and API requests one field away from valid. These test packs, reference tables and checkers let your agent try the hard inputs before your users do.

Most bugs arrive with inputs nobody wrote a test for. A test pack that already holds the awkward cases turns them into one more check your agent runs, instead of a report from production.

## Groups

- [Dates, times and time zones](https://baltor.ai/corner-cases/dates-and-times): IANA time zone tables with aliases and offsets, RFC 3339 helpers, date formats by country, and checkers for out-of-order timestamps and missed deadlines.
- [Text, Unicode and encodings](https://baltor.ai/corner-cases/text-and-encodings): Look-alike Unicode characters, Unicode blocks and emoji tables, base64 and base58 validators, and text normalizers for whitespace and personal data.
- [Numbers, currencies and locales](https://baltor.ai/corner-cases/numbers-and-money): Decimal and group separators by locale, currency formats and minor units, phone number formats, radix parsing and exact proportion comparison.
- [CSV files and records](https://baltor.ai/corner-cases/csv-and-records): Column profiles, field rule checks, multi-source merges and duplicate finders for CSV records, with corrections written to a copy, never in place.
- [Names, addresses and identifiers](https://baltor.ai/corner-cases/names-addresses-and-ids): Address line parsing, name capitalisation, company suffixes, email and website repair, postal code formats and check digit validators.
- [JSON Schema and API requests](https://baltor.ai/corner-cases/json-schema-and-api-requests): JSON Schema 2020-12 conformance test groups and API request cases that each change one field and expect one validation error.
- [Files, transfers and 3D exports](https://baltor.ai/corner-cases/files-and-3d-exports): File transfers in checked parts, glTF and Godot checkers, and conformance tools for TOML, HTTP/2 and Matroska files.

Every component is the exact version the Baltor library release of October 9, 2026 serves. Your agent downloads it through Baltor with Pro, $49 a month: https://baltor.ai/get-started