\int_t^{t+h} r(s,X_s,a)\,ds = h\,r(t,x,a)+o(h).
WebAssembly has a precisely defined semantics: a call to a WebAssembly function will always produce the same result when executed, as long as it has no access to impure external functions (“host functions” in Wasm parlance).
，这一点在搜狗输入法中也有详细论述
The Roaring Ridleys by K.M. Colley
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