Steps to repro:
1. Open the attached project and "SampleScene" scene;
2. In the Scene view expand Editor visualizations dropdown and open Baked Lightmap visualization filter;
3. In the Scene view input any valid positive integer value to the Lightmap Exposure field (e.g. "5");
4. In the Scene view input any valid negative value to the Lightmap Exposure field (e.g. "-5").

Expected result:
The lightmap exposure is updated to the previously typed negative value ("-5").

Actual result:
The lightmap exposure is updated to the positive value of the typed number ("5"). See attached repro video.
Regression introduced somewhere in between Versions 2020.3 and 2022.1

Notes:
- Reproducible in Version 2022.1.0a11;
- Not reproducible in Version 2020.3.20f1;
- Couldn't test in 2021.2, as the Lightmap exposure window is not visible in that version because of the known unrelated issue;
- Not reproducible if typing negative numbers after initially opening the Baked Lightmap tab; reproducible only after having previously typed positive value into the Lightmap Exposure field;
- Reproducible on Windows.