> > Is this a correct reading of the spec? Is this a bug in the spec? > https://github.com/tc39/test262/blob/master/test/built-ins/RegExp/Symbol.species/symbol-species.js > tests > that the RegExp[Symbol.species] property is configurable. Additionally, it > appears to break at least one major webpage if RegExp[Symbol.species] is > not configurable. >
Check out the last two paragraphs of https://tc39.github.io/ecma262/#sec-ecmascript-standard-built-in-objects, which specifies the default property attributes for the standard built-ins.
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