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import { cloneList } from './_internals/cloneList.js'import { includes } from './includes.js'
export function union(x, y){  if (arguments.length === 1) return _y => union(x, _y)
  const toReturn = cloneList(x)
  y.forEach(yInstance => {    if (!includes(yInstance, x)) toReturn.push(yInstance)  })
  return toReturn}