`mapN` is gone about funfix HOT 4 CLOSED

@OliverJAsh which class mapN are missing from? Those are still present at least for IO and Future (v7.0.1), dunno about others, didn't use them

• https://github.com/funfix/funfix/blob/master/packages/funfix-exec/src/future.ts#L980
• https://github.com/funfix/funfix/blob/master/packages/funfix-effect/src/eval.ts#L371

UPD: Sorry, I confused mapN with map1 - map6

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It's probably the Option (v6.2.2: https://github.com/funfix/funfix/blob/v6.2.2/packages/funfix-core/src/disjunctions.ts#L652)

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I removed mapN because it's non-standard and it was less useful than I thought it is.

Option also has filter on it, so you can do ... option.filter(_ != null) and I find this one more intuitive.

If you have a good use case for it, I'm willing to add it back.

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Actually the use-case would be the one in the sample:

Option.of(user)
  .mapN(_ => _.contacts)
  .mapN(_ => _.length)

But in this case I kind of used Try instead, so Try.of(() => user.contacts.length).

So you know, if you liked mapN, copy/paste it from 6.2.2 and make a PR to re-add it.

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