CreateDataPropertyOrThrow is new in the ES6 spec, which explains why it
hasn't
occurred in V8 so far. (Likewise, DONT_DELETE predates ES5, which chose to
rename it to (not) configurable, along with renames for the other property
attributes.)
On the other hand, V8 internally distinguished named properties from indexed
properties (a.k.a. elements). We also have to fit in V8 API functionality
like
interceptors, which sometimes is at odds with how the spec is factored. We
hence
need different sets of methods internally, with somewhat different
invariants.
It would definitely make sense to clean some of this up and get it more in
sync
with the new spec. We are slowly doing some such clean-ups, but it's not
trivial
at all. It needs to be designed carefully, and definitely is outside the
scope
of this CL.
For the time being, CreateDataProperty should translate to
AddProperty/Element.
Assignment definitely is incorrect (which might well be wrong in other
places
currently -- please feel free to submit patches :) ).
https://codereview.chromium.org/364853009/
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