.chain({ type: 'mapReduce' }) and .chain().mapReduce() return raw data, rather than ResultSet

[patarapolw]

These destroy the meaning of chaining. I cannot use Loki methods further.

  console.log(
    zhDict
      .chain()
      .find({ entry: { $nin: ['尖嘴鱼'] } })
      .mapReduce(
        (o: any) => {
          o._alt = o.alt ? o.alt.join('\x1f') : undefined
          return o
        },
        (vs: any[]) => {
          const prev: any = []
          vs.map((o) => {
            if (o._alt && ['開', '魚'].some((el) => o._alt.includes(el))) {
              prev.push(o)
            }
          })

          return prev
        }
      )
  )
// Is Array of data, not ResultSet

  console.log(
    zhDict.vocab.chain([
      {
        type: 'mapReduce',
        mapFunction: (o) => {
          o._alt = o.alt ? o.alt.join('\x1f') : undefined
          return o
        },
        reduceFunction: (vs: any[]) => {
          const prev: any = []
          vs.map((o) => {
            if (o._alt && ['開', '魚'].some((el) => o._alt.includes(el))) {
              prev.push(o)
            }
          })

          return prev
        },
      },
    ])
  )

I see that I use string operations anyway, I am not use if I can use indices...

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