# Changelog for hs-opentelemetry-propagator-w3c
## Unreleased
## 1.0.0.0 - 2026-05-29
- `propagatorNames` renamed to `propagatorFields` and now returns actual header names (`traceparent`, `tracestate`) instead of `tracecontext`, conforming to the spec `Fields` requirement
- Fix multi-header `tracestate` inbound: all `tracestate` headers are now combined per RFC 7230 before parsing (previously only the first was used)
- Fix: reject `traceparent` with all-zero `trace-id` or `parent-id` (W3C spec requires these to be non-zero)
## 0.1.0.0
### Added
- Complete W3C tracestate header parsing and encoding support
- `tracestateParser` for parsing W3C tracestate headers according to specification
- `encodeTraceState` function for serializing TraceState to W3C format
- `encodeTraceStateFull` for serializing complete TraceState without HTTP header limits
- `encodeTraceStateMultiple` for splitting TraceState into multiple headers with size constraints
- `decodeTraceStateMultiple` for combining multiple tracestate headers per RFC7230
- Proper validation of tracestate keys and values per W3C spec
- Support for up to 32 tracestate entries as per specification
- Multi-tenant key format support (`tenant@vendor`)
- Automatic removal of oversized entries (>128 chars) as per W3C truncation guidance
- RFC7230-compliant header field combining with comma separation
- Comprehensive test coverage for tracestate functionality
### Changed
- `encodeSpanContext` now includes tracestate in returned tuple
- `decodeSpanContext` now properly decodes and validates tracestate headers
### Dependencies
- Added `text` dependency for tracestate text processing
## 0.0.1.4
- Support newer dependencies
## 0.0.1.1
- Update to hs-opentelemetry-api == 0.0.2.*
## 0.0.1.0
- Initial release