super.prop assignment can silently overwrite non-writable properties

[Allen Wirfs-Brock]

On Apr 20, 2015 12:42 PM, Caitlin Potter <caitpotter88 at gmail.com> wrote:
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> Oh — he’s right, ValidateAndApplyPropertyDescriptor won’t throw in the example case, because the old descriptor is configurable. That’s kind of weird

Hmm...I'm not at my machine right now.  When I am I'll to make sure thus isn't a regression from ES5
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