On object extension

[Jake Verbaten]

> First, if obj already has a non-configurable property 'a', this will
throw

I don't think object extension on a non configurable properties should be a
no op.

Your basically saying "extend obj with { a: 1 } unless doing so would throw
an error, in which case fail silently"

Personally I don't like silent failure points.

> Another feature which could be handy is extending an object with another
already existing object (aka mixins?).

Having some kind build in API to mixin / extend objects would indeed be
helpful
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