What is fp.cons(1,2)?

It does not exist.
  • [[1], [2]]
  • [1, [2]]
  • [1, 2]

What type of value does the fp.cons function return?

In the API for fp.cons, are there any restrictions on the acceptable values for its first argument?

In the API for fp.cons, are there any restrictions on the acceptable values for its second argument?