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export function memoizeWith(keyGen, fn){  if (arguments.length === 1){    return _fn => memoizeWith(keyGen, _fn)  }  const cache = new Map()
  return function (){    const key = keyGen.apply(this, arguments)    if (!cache.has(key)){      cache.set(key, fn.apply(this, arguments))    }
    return cache.get(key)  }}