this post was submitted on 12 May 2026
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skipped a few steps there i think.
anyway, good question. led me to some cursed code.
the ArrayObject in spidermonkey is an interface to either a TypedArrayObject or a SharedArrayObject. those both have an inner ArrayBuffer object, which is a view into ArrayBufferObjectMaybeShared, which contains a refcounted vector of uint8 pointers, regardless of the datatype. soooo all arrays in javascript are... strings?
That's a different kind of array (Float32Array etc.), not the "normal" kind.
i couldn't actually find any of that in spidermonkey. i was looking in js/vm/arrayobject and its parents, didn't see any others.
I'm guessing it's this? https://searchfox.org/firefox-main/source/js/src/builtin/Array.cpp
i did look at that but i started out here: https://searchfox.org/firefox-main/source/js/src/vm/ArrayObject.h because it inherits from NativeObject.
Yes, and since that's the wrong place I kept looking, and found the link I just sent you
i edited my thing, i did start at array.cpp but only found references to other places so i went digging down the stack.