Add more `constexpr`

[codecov[bot]]

Codecov Report

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

Project coverage is 99.67%. Comparing base (1ea48a8) to head (229a8c7). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #81 +/- ## ======================================= Coverage 99.66% 99.67% ======================================= Files 14 14 Lines 2424 2425 +1 Branches 382 383 +1 ======================================= + Hits 2416 2417 +1 Misses 8 8 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.