undefined-behavior

Bun's Rust rewrite fails basic Miri checks, allowing undefined behavior in safe Rust, raising serious safety concerns.

C++26 is introducing standardized library hardening to catch common undefined behavior (like out-of-bounds access) at runtime, based on Google's production experience showing a mere 0.30% performance overhead and a 30% reduction in segmentation faults.

Analyzes the undefined behavior of the C/C++ expression 'a = a++ + ++a;' for int a=5, demonstrating three possible results (11, 12, 13) due to compiler-dependent evaluation order and post-increment handling, with theoretical and experimental breakdown.