the code doesn’t look like idiomatic F#. the hot paths are full of mutable state, spans, and memory-pooled arrays. earlier versions even used raw pointers. F# is first and foremost a functional language, and bending it toward low-level systems programming took some effort. but it does support the constructs you need when performance matters, and the language really shines where it counts most for this project: expressing the algorithms themselves. the core data structure for regexes is a recursive discriminated union, which is a natural fit for F#‘s algebraic data types:
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unsigned a = 3357492005;