constructor( count, itemSize, typeClass = Float32Array ) {

		const array = ArrayBuffer.isView( count ) ? count : new typeClass( count * itemSize );

		super( array, itemSize );

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isStorageInstancedBufferAttribute = true;

	}
Constructs a new storage instanced buffer attribute.

@param {number|TypedArray} count - The item count. It is also valid to pass a typed array as an argument.
The subsequent parameters are then obsolete.
@param {number} itemSize - The item size.
@param {TypedArray.constructor} [typeClass=Float32Array] - A typed array constructor.