Sourced from jsonschema's releases.

[Python] Release 0.44.0

Added

• canonical.json.to_string(object) for canonical JSON serialization (stable key ordering and numeric normalization), useful for deduplicating equivalent JSON Schemas.

Fixed

• Do not produce annotations for non-string instances from contentMediaType, contentEncoding, and contentSchema keywords.
• Crash when serializing strings with invalid UTF-8 (e.g., lone surrogates) during schema/instance conversion.
• Crash when serializing dicts keyed by str enums whose value lookup raises an exception.
• Crash when serializing enum instances whose value lookup raises an exception.
• Reference leak when serializing enum instances repeatedly.

Sourced from jsonschema's changelog.

[0.44.0] - 2026-03-02

Added

• canonical::json::to_string(value) for canonical JSON serialization (stable key ordering and numeric normalization), useful for deduplicating equivalent JSON Schemas.

Fixed

• Do not produce annotations for non-string instances from contentMediaType, contentEncoding, and contentSchema keywords.

[0.43.0] - 2026-02-28

Performance

• Optimize pattern and patternProperties for ^(a|b|c)$ alternations via linear array scan.
• Optimize ^\S*$ patterns by replacing regex with a direct ECMA-262 whitespace check.

Fixed

• anyOf, format, unevaluatedProperties, and unevaluatedItems now correctly collect annotations per spec.

[0.42.2] - 2026-02-26

Fixed

• SWAR digit parser accepted bytes :–? (0x3A–0x3F) as valid digits during date, time, and date-time format validation, potentially allowing malformed values to pass.

Performance

• Extend pattern prefix optimization to handle escaped slashes (^\/) and exact-match patterns (^\$ref$).
• Specialize enum for cases when all variants are strings.

[0.42.1] - 2026-02-17

Performance

• Reduce dynamic dispatch overhead for non-recursive $ref resolution.
• Cache ECMA regex transformations during format: "regex" validation.

[0.42.0] - 2026-02-14

Added

• JsonType::as_str method for zero-allocation type name access.
• ValidationErrorKind::keyword is now public.
• tls-ring feature flag to opt into using ring as the TLS crypto provider instead of the default aws-lc-rs. #997
• CLI: Support YAML (.yaml/.yml) instance files in text output mode. #988

Changed

... (truncated)

• 9bbbb49 chore(ruby): Release 0.44.0
• f252951 build(deps): bump crates/jsonschema/tests/suite
• 23a9118 chore(python): Release 0.44.0
• 5f74106 chore(rust): Release 0.44.0
• 6699215 feat(python): Efficient schema cloning
• 39235e1 chore: Restructure canonicalisation
• 90f972b feat: canonical_to_string for canonical JSON serialization
• b1e05fe feat(ruby): canonical_dumps(object) for canonical JSON serialization
• 351b49a fix: Annotations from contentSchema
• a8fdb45 build: Add timeouts & concurrency control to CI jobs
• Additional commits viewable in compare view

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