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Zig Adds Pointer Stability Locks to std.ArrayList

Zig's main branch now supports pointer stability locks for std.ArrayList, a memory-safety mechanism previously introduced for Hash Map containers in 2024. Developers can call lockPointers() when holding pointers or slices into an ArrayList, then unlockPointers() once those references are no longer needed, preventing use-after-free bugs caused by reallocation. The feature originated from a pull request opened by contributor Leo Emar-Kar in 2025 and was documented by Robbie Lyman.