Comment #2 on issue 4315 by erights: some TypedArray static method
properties non-config, non-writable
https://code.google.com/p/v8/issues/detail?id=4315
Allen points out that
Float32Array.from Float32Array.of Float64Array.from Float64Array.of
Int16Array.from Int16Array.of Int32Array.from Int32Array.of Int8Array.from
Int8Array.of Uint16Array.from Uint16Array.of Uint32Array.from
Uint32Array.of Uint8Array.from Uint8Array.of Uint8ClampedArray.from
Uint8ClampedArray.of
don't even exist in the ES6 spec. Instead, 'from' and 'of' are specified
as properties of the %TypedArray% object
(http://www.ecma-international.org/ecma-262/6.0/#sec-%typedarray%-intrinsic-object
), which is the [[Prototype]] of all of the concrete Typed Array
constructors. Float32Array, Flat64Array, etc. all inherit a common
definition of 'from' and 'of' from %TypedArray%.
Regarding the attributes values for 'from' and 'of'. The spec. says
nothing special about them
http://www.ecma-international.org/ecma-262/6.0/#sec-%typedarray%.from
http://www.ecma-international.org/ecma-262/6.0/#sec-%typedarray%.of
so they should have the default attribute values used for built-in methods
{[[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true} as
specified in the second to last paragraph of
http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-standard-built-in-objects
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