function typedArraySupport () {
                        try {
                            var arr = new Uint8Array(1)
                            arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
                            return arr.foo() === 42 && // typed array instances can be augmented
                                typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
                                arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
                        } catch (e) {
                            return false
                        }
                    }
Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.