Comment #5 on issue 1451 by [email protected]: Array.forEach, filter,
some, etc. are not special-cased for sparse arrays.
https://code.google.com/p/v8/issues/detail?id=1451
Using a sparse array for something that is easily hashable - such as an
IPv4 address, or in this case, a similar machine identifier, is an obvious
thing to do in Javascript. There is nothing in the Javascript spec that
indicates large key values are deprecated - that is actually a useful
feature of the Javascript array.
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