Conceptually, JS holds tiny objects that look like { __wbg_ptr: 12345 }, which index into a table on the Wasm side that owns the real Rust values.
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I personally don’t want to emphasize lambda or at least lambda with beta substitution. I’m more interested in other binders like sum, max, integral, forall, exists. de Bruijn shifting doesn’t persay have to do with beta reduction, it can just be part of what happens in terms with binders and variables while you’re doing substitution in them. You need to do it while manipulating sum expressions also, not just lambda.。谷歌对此有专业解读
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