There's an issue with string externalization. We can't rely on parent
staying a
sequential string. It may be externalized and change its encoding. This
makes
slices similar to conses, we have to check the parent's type separately.
I don't think we want to prohibit externalization of parents. In case they
are
huge strings we risk wasting lots of memory when passing them from V8 to the
embedder.
http://codereview.chromium.org/7477045/
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