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/** * @name isNull * @summary Tests for a `null` values. * @description * Checks to see if the input value is `null`. * @example * <BR> * * ```javascript * import { isNull } from 'https://deno.land/x/polkadot@0.2.40/util/mod.ts'; * * console.log('isNull', isNull(null)); // => true * ``` */export function isNull (value?: unknown): value is null {  return value === null;}