Yet another attempt at typed JS data

Andrea Giammarchi andrea.giammarchi at
Tue Feb 11 18:49:56 UTC 2020

So ...

On Tue, Feb 11, 2020 at 5:44 PM Isiah Meadows <contact at>

> You have proof of this? That it doesn't produce a dense array in engines?

Yes, I have d8 traces, after long discussions in twitter too, that shows
there's no way to have PACKED_SMI_ELEMENTS, but also a bug in Chromium from
2017, but if you need any other proof, I can figure out which other engine
has the same issue, although I am not sure all engines follow same
optimizations with the "packed" vs "holey" v8 concept.
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