Upgrading to 4.2.0

Update dependencies together

Use 4.2.0 for core and all selected format modules, and recompile consumers against the new API.

Removed registry

UpdateStrategyRegistry has been removed. Replace global registrations with a parser's defaultUpdateStrategy, builder updateStrategy(...), or shared LoaderSettings.updateStrategy.

Builder updateStrategy(null) explicitly disables updates. A null strategy in shared settings uses the parser's default instead.

Custom parsers and builders

• Custom parsers must return Map<String, Any?> from parse(...).
• Implement write(OutputStream, Map<String, Any?>) and leave caller-owned streams open.
• Replace direct object writing with document maps.
• Custom ConfigLoaderBuilder implementations must implement updateStrategy(UpdateStrategy?).

JSON dependency

The JSON module no longer depends on Jackson's Kotlin module: parsing works on document maps. Applications using that transitive dependency for their own Jackson object mapping must declare it themselves.

Fix invalid configurations

Present invalid values no longer silently use defaults. Unknown enum elements are rejected instead of skipped. Explicit null for a non-null field fails even when a default exists. Integer fractions, overflow, non-finite floats, invalid booleans, and invalid collection elements cause conversion errors.

Review mapping and validation and correct affected files before loading them.

File compatibility

YAML and JSON file formats remain supported. No data-format migration is required. Existing Yacla.yaml, Yacla.json, builder entry points, and language selection methods remain available. The stricter validation rules can still require edits to previously accepted invalid values.