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#417 — Array.prototype.slice does not set length correctly if trailing elements are holes

Immediately before line 11 new top level line needs to be inserted:

10.5 Call the [[Put]] internal method of A with arguments "length",
final, and true.

The ES3 spec. has the equivalent of the above line. It was apparently
inadvertently dropped in the ES5 spec.

(marked as in progress to indicate that this is an errata item)

Bulk resolving ES5.1 errata issues as a sampling suggests these are all fixed. If this is in error, please open a new issue on GitHub.