Comment #1 on issue 4317 by [email protected]: @@isConcatSpreadable is
ignored by Array.prototype.concat when the arguments are arrays
https://code.google.com/p/v8/issues/detail?id=4317
this doesn't seem quite seem right to me.
var b = [];
b[Symbol.isConcatSpreadable] = false;
[].concat(b).length; // 0, should be 1 // How are you deciding that this
should be "1"?
The steps from the algorithm:
1. If Type(O) is not Object, return false.
2. Let spreadable be Get(O, @@isConcatSpreadable).
3. ReturnIfAbrupt(spreadable).
4. If spreadable is not undefined, return ToBoolean(spreadable).
5. Return IsArray(O).
IsArray() is only returned if the value of @@isConcatSpreadable is
undefined.
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