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用 replacement function hook 一个 target function，并返回 original target closure 的 cloned copy。两个 arguments 都必须是 functions。function 首先 flush pending C function swaps，通过 function cloning cloning target，将 replacement closure 或它的 mapped newcclosure target 添加到 hidden stack tracking，对 target 和 cloned original 调用 FixCallstack，然后通过 C closure, Luau closure 或 newcclosure-specific path patch target closure。如果 target 尚未在 hook records 中，则 cloned original 会存储在那里供 restorefunction 使用。returned function 是 cloned original closure。
hookfunction(target: function, replacement: function): function
hookfuncreplaceclosuredetourfunctiondetour_functionlocal function target(value)
return value + 1
end
local original
original = hookfunction(target, function(value)
return original(value) * 2
end)