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/** * @name isU8a * @summary Tests for a `Uint8Array` object instance. * @description * Checks to see if the input object is an instance of `Uint8Array`. * @example * <BR> * * ```javascript * import { isUint8Array } from 'https://deno.land/x/polkadot@0.2.40/util/mod.ts'; * * console.log('isU8a', isU8a([])); // => false * ``` */export function isU8a (value?: unknown): value is Uint8Array {  // here we defer the instanceof check which is actually slightly  // slower than just checking the constrctor (direct instances)  return (    ((value && (value as Uint8Array).constructor) === Uint8Array) ||    value instanceof Uint8Array  );}