Crystal 1.20.0 Is Released

8 hours ago

Introduction of @[TargetFeature] annotation for specifying CPU features or models for individual functions, enhancing runtime adaptability for optimized code execution.
Preview of the new Process API for spawning sub-processes, featuring an array of strings for command line arguments and methods like Process.capture for easier output handling.
Addition of an experimental io_uring-based event loop for Linux, selectable via -Devloop=io_uring, with potential performance considerations and behavior changes.
Support for Kernel TLS on Linux and FreeBSD by default, requiring system and OpenSSL compatibility for secure TLS connections.
Inclusion of M:N scheduling in execution contexts, plus adaptive scaling in parallel contexts, as part of multi-threading improvements.
Security fix in HTTP::Server to reject requests with both Content-Length and Transfer-Encoding headers, addressing HTTP request smuggling vulnerabilities.
Updates to the standard library, including OptionParser with option bundling, HTTP::WebSocket sub-protocol negotiation, and various enhancements to StringScanner.
Compiler now defaults to modern linkers like mold or lld when available, and support for newer LLVM versions such as LLVM 22.1 and 23.0.
Deprecation of Mutex in favor of Sync::Mutex, starting with a soft deprecation via documentation warnings.

Hasty Briefsbeta