lazy-collections has pipelines which don't seem to be doing what's intended

[marjakh]

E.g., this:

    const doubleFibonaccis = pipe(
      fibonacci(),
      take(78),
      windows(3),
      flatMap(x => x * 2),
      unique(),
      toArray(),
    );

after windows(3), every element is a 3-element array, so flatMap just produces NaNs, and it goes downhill from there. In the end, doubleFibonaccis() is just [NaN].

It's hard to say what the intention is; based on the name doubleFibonaccis it's maybe just this:

    const doubleFibonaccis = pipe(
      fibonacci(),
      take(78),
      flatMap(x => x * 2),
      unique(),
      toArray(),
    );

unless you want to have windows(3) in there? In that case, you could also do:

    const doubleFibonaccis = pipe(
      fibonacci(),
      take(78),
      windows(3),
      flatMap(window => window.map(x => x * 2)),
      unique(),
      toArray()
    );

[camillobruni]

As per meeting discussion, going to fix this v4.