Inline and improve types

[codecov[bot]]

Codecov Report

Patch coverage: 86.08% and project coverage change: -4.38 :warning:

Comparison is base (bdb9000) 95.21% compared to head (bbe9f2e) 90.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================== - Coverage 95.21% 90.84% -4.38% ========================================== Files 12 12 Lines 481 568 +87 ========================================== + Hits 458 516 +58 - Misses 23 52 +29 ``` | [Impacted Files](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal) | Coverage Δ | | |---|---|---| | [src/pykka/debug.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL2RlYnVnLnB5) | `0.00% <0.00%> (ø)` | | | [src/pykka/\_ref.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19yZWYucHk=) | `88.00% <75.67%> (-12.00%)` | :arrow_down: | | [src/pykka/\_actor.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19hY3Rvci5weQ==) | `91.42% <84.21%> (-3.85%)` | :arrow_down: | | [src/pykka/\_registry.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19yZWdpc3RyeS5weQ==) | `94.20% <84.61%> (-5.80%)` | :arrow_down: | | [src/pykka/\_envelope.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19lbnZlbG9wZS5weQ==) | `92.85% <90.00%> (-7.15%)` | :arrow_down: | | [src/pykka/\_future.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19mdXR1cmUucHk=) | `96.15% <92.59%> (-3.85%)` | :arrow_down: | | [src/pykka/\_threading.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL190aHJlYWRpbmcucHk=) | `94.73% <93.33%> (-1.56%)` | :arrow_down: | | [src/pykka/\_proxy.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL19wcm94eS5weQ==) | `97.39% <94.73%> (-1.63%)` | :arrow_down: | | [src/pykka/messages.py](https://app.codecov.io/gh/jodal/pykka/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal#diff-c3JjL3B5a2thL21lc3NhZ2VzLnB5) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/jodal/pykka/pull/192/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stein+Magnus+Jodal)

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