v9.1.0

What's Changed

New features

• Implement SQL on FHIR repeat directive for recursive traversal of nested structures by @piotrszul in #2516
• Implement toQuantity() and convertsToQuantity() FHIRPath functions with UCUM unit conversion support by @piotrszul in #2514

Bug fixes

• Fix getResourceKey() returning versioned IDs that don't match getReferenceKey() (#2519) by @johngrimes in #2520

Security updates

• Bump ch.qos.logback:logback-core from 1.5.18 to 1.5.19 (CVE-2025-11226) by @dependabot in #2506

Other changes

• Migrate to uv and Bun for dependency management by @johngrimes in #2515

Full Changelog: v9.0.0...v9.1.0