JS: -fcheck-prim-bounds is completely broken for ByteArray# ops
Although there are several problems, the biggest is that the code emitted for the checks looks at the
length field when the
ByteArray# objects store their sizes in the
len field. JS being JS, this causes most bounds-checks to silently result in "out-of-bounds", with no indication that something else is wrong.
(forked from !9629 (comment 484210))
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