Warning: The following is a sickening idea. I would really hate to see us
do it. But I feel obliged to post it as it may in fact be the right thing
to do.
Given: Web reality drives us towards recognizing {...., __proto__: ....,
....} as special syntax for initializing [[Prototype]].
Given: JSON demands that the "__proto__" in JSON.parse('{...., "__proto__":
...., ....}') not be treated as a special case, and causes just the normal
[[DefineOwnProperty]].
Given: Web reality does not make demands on the meaning of {....,
"__proto__": ...., ....}
Given: The ES5 JSON spec demands that JSON.parse('{...., __proto__: ....,
....}') be rejected as an error.
This suggests that, in JS as well, the "__proto__" in {...., "__proto__":
...., ....} not be treated as a special case. Quoting it turns off the
special treatment.
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