scriptc

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Chris Tate 81bf6cb0c7 Check integer-or-NaN indexes without a double round trip

An array or typed-array index that is an exact integer or NaN, such as an
element read that may miss (`t[i]!`), a `charCodeAt`, or a sum of those, is
a valid index when it is ordered and below the length. The index check now
tests that with one ordered compare and the integer, taken from the value's
32-bit view or from one conversion, instead of converting the index back to a
double and comparing it.

Number locals that are declared once with an initializer, are not captured
or boxed, and are only written such values carry the same fact, so
`const c = t[i]!; table[c]` and `(h * 31 + c) | 0` take the integer paths
that the inline read already takes.

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corpus

Check integer-or-NaN indexes without a double round trip

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coverage-fixtures

Throw for every object on the right of an arrow instanceof, and give blocked bodies their this

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deadstrip

…

diagnostics

Fence arguments.length in function expressions that call themselves by name

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