Improve `noexcept` usage.

[1uc]

Closes #974

[codecov-commenter]

Codecov Report

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

Project coverage is 86.29%. Comparing base (5afd834) to head (711299a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #997 +/- ## ======================================= Coverage 86.29% 86.29% ======================================= Files 94 94 Lines 5998 5998 ======================================= Hits 5176 5176 Misses 822 822 ```

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