[feat] package types: generics Nullable for unpacking

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.04% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (9401de4f3f951620fa88a4cf00531b26c76c8e37) | 4549 | 4213 | 92.61% | | | Head commit (4cadf48c8310cf474f774dfa602c5db9080a8848) | 4572 (+23) | 4236 (+23) | 92.65% (**+0.04%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#99) | 23 | 23 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.13%. Comparing base (9401de4) to head (4cadf48).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #99 +/- ## ========================================== + Coverage 90.08% 90.13% +0.04% ========================================== Files 38 39 +1 Lines 4419 4440 +21 ========================================== + Hits 3981 4002 +21 Misses 330 330 Partials 108 108 ```

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