Heck but not Heck because it's not Heck but cooler than Heck heck
Uses small buffer optimization for vector: https://github.com/KonanM/small_vector/blob/master/include/small_vector/small_vector.h
C++那些事
Small Hash Optimization - an optimization for when you have many small hash maps - similar to LLV...
Performance-portable, length-agnostic SIMD with runtime dispatch
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C++20 Static Branch library
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A dynamically-resizable vector with fixed capacity and embedded storage
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