- add: configurable compression level for the APCu serializer (brotli.apcu_compression_level)
- fix: SIGSEGV in the APCu serializer callbacks on ZTS shared builds
- fix: CG(empty_string) crash in the smart_str_extract() fallback on PHP 7.1 ZTS
- fix: heap-buffer-overflow in php_brotli_decompress_read() inner read
- fix: heap-use-after-free in php_brotli_decompress_read()
- fix: propagate failure of brotli_uncompress_add() to the caller
- fix: UBSAN-detected undefined behavior in brotli_uncompress_add()
- fix: build on PHP 8.6+