Status: Assigned
Owner: [email protected]
Labels: Type-Bug Priority-Medium Harmony Area-Language
New issue 4316 by [email protected]: Array.prototype.concat always
creates Arrays
https://code.google.com/p/v8/issues/detail?id=4316
Array.prototype.concat seems to be implemented as per ES5, not ES2015--it
creates arrays, rather than making an instance of the (species of the)
constructor of the receiver. For example,
d8> Array.prototype.concat.call(new Uint8Array([1, 2]), 3)
[1,2, 3]
The first element of that is 1,2, a TypedArray, and the second is 3. It is
in an Array. However, the result should actually be throwing a TypeError.
http://ecma-international.org/ecma-262/6.0/#sec-array.prototype.concat
22.1.3.1 step 7.d.v.4.c calls CreateDataPropertyOrThrow, which will fail on
a TypedArray. A TypedArray should be created rather than an array based on
step 3 which calls ArraySpeciesCreate based on the receiver, and that will
create a zero-length TypedArray. Integer Indexed Exotic Objects do not
allow new numerically indexed properties to be created.
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