Dmitry Kurinskiy 83d5a7b2a3
Introducing top and bottom types (#199)
* - Added top and bottom types
- Added nil for empty streams, options, arrays
- Fixed product variance

* Version bump due to syntax changes in the type system
2021-07-13 17:43:24 +03:00
..
2021-06-25 10:25:27 +03:00