ecmascript-object-observe
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ECMAScript Object.observe spec
The current spec is silent on this, which will cause records to be created in the Realm of the function where object mutation occurs, record arrays to be created who-knows-where...
Array.prototype.fill is a new mutating array method so it will need splice notifications too.
Today we have _filtering_ on the accept type. There is also another dimension of filtering. Namely filtering based on property names. If I only care about the property names `'abc'`...