Unexpected behavior of pair operation over empty collection

[ghost]

Steps required to reproduce the problem

See following code example:

Collection::fromIterable([])->pair()->all(false)

Expected Result

It was expected that code would return empty array []

Actual Result

But it returns following garbage information:

array:1 [
  "" => null
]

[drupol]

Hi !

Thanks for reporting the issue, nice catch!

I fixed it in #327 and added a test.