Le 07/07/2011 14:29, Andreas Rossberg a écrit :
On 7 July 2011 13:11, Tom Van Cutsem<tomvc...@gmail.com> wrote:
2011/7/6 Andreas Rossberg<rossb...@google.com>
It seems like a reasonable assumption, but is not currently the case
everywhere (e.g. the default implementation for `keys' can violate
this assumption when passing names to this.getOwnPropertyDescriptor).
How so? The default implementation for the keys trap relies on the return
value of the getOwnPropertyNames() trap, whose return value is coerced to an
array of Strings.
Not quite. The coercion is taking place in Object.getOwnPropertyNames,
but the default `keys' trap doesn't go through that, but instead calls
the trap directly. Moreover, it has to do it like that, because it
doesn't even have a reference to the proxy itself.
However, if we assume that the getOwnPropertyNames trap is able to do
type coercion on its output, there is no reason for the keys trap to not
do that too, regardless of how it was implemented.
David
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