Linus Groh 433a23cfde LibJS: Fix array hole and string object indexing prototype indirection ...

This fixes two cases of indexed access (array holes, out-of-bounds
string object access) where we would not follow the prototype chain and
incorrectly return undefined:

    // Should be "a", returned undefined
    Object.setPrototypeOf([,], ["a"])[0]

    // Should be "a", returned undefined
    Object.setPrototypeOf(new String(""), new String("a"))[0]

The actual fix is simple, instead of returning early if the requested
index is past the string's length or within the indexed properties size
but has no value, we just continue the prototype chain traversal and get
correct behaviour from that.

2021-04-11 18:15:47 +02:00

39 KiB

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