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<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request This PR addresses an issue where direct double output from exprtk evaluation led to precision artifacts (e.g., 12.2 + 10 resulting in 22.199999999999999). This behavior is due to how double represents decimal fractions in binary. - To improve user-facing precision, the result is now: - Converted to decimal for higher decimal accuracy. - Rounded to fit within 15 total significant digits (integer + fraction). - Formatted using "G29" to eliminate unnecessary trailing zeros. - Cleaned up to remove dangling decimal points. This ensures more intuitive and readable output like: - 1.9999999999 → "1.9999999999" - 100000.9999999999 → "100001" - 100000.999999999 → "100000.999999999" This change improves clarity, especially for users entering expressions expecting decimal-accurate results. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [ ] **Closes:** #40097 - [ ] **Communication:** I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected - [ ] **Tests:** Added/updated and all pass - [ ] **Localization:** All end-user-facing strings can be localized - [ ] **Dev docs:** Added/updated - [ ] **New binaries:** Added on the required places - [ ] [JSON for signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json) for new binaries - [ ] [WXS for installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs) for new binaries and localization folder - [ ] [YML for CI pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml) for new test projects - [ ] [YML for signed pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml) - [ ] **Documentation updated:** If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys) and link it here: #xxx <!-- Provide a more detailed description of the PR, other things fixed, or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed