v4.2.8

[4.2.8] - 2026-02-02

Fixed

Python Bindings

• ChunkingConfig serde serialization: Fixed config_to_json() and config_get_field() outputting max_characters/overlap instead of max_chars/max_overlap by using serde(rename) instead of alias for backwards-compatible serialization

Java Bindings

• ARM64 SIGBUS crash in kreuzberg_get_error_details: Added kreuzberg_get_error_details_ptr() returning a heap-allocated pointer instead of struct-by-value, fixing ABI mismatch in Java Panama FFI on ARM64 architectures
• E2E test compilation errors: Updated E2EHelpers to use getMetadataMap() and getElementType().name() matching current API

Ruby Bindings

• rb_sys build dependency: Moved rb_sys from development to runtime dependency in gemspec so bundler installs it before compiling the native extension, fixing LoadError: cannot load such file -- rb_sys/mkmf for end users
• Flaky concurrent extraction test: Prevented Tempfile garbage collection in thread safety test by keeping references alive during concurrent extraction

FFI

• Added kreuzberg_free_error_details(): New function to properly free heap-allocated CErrorDetails structs and their internal string fields

Changed

CI

• Rust test parallelization: Removed --test-threads=1 from unit test script, enabling parallel test execution across 80+ test files
• Rust CI timeout: Reduced job timeout from 180 to 60 minutes