<!-- --------Before Creating a New Issue----------- * Limit report to a single issue. * Search the issue tracker to verify the issue has not already been reported. * Complete all instructions between `template markers <>. * Keep report contents limited to the necessary information required to fix the issue. ---------Add your issue details below----------- --> # Description <!-- What is the current behavior and what is the expected behavior? --> While editing pad properties in the PCB Editor, I noticed rounding errors appearing. After a bit more testing, these rounding errors apparently only appear when the units are set to "mils". <!-- If the issue is visual/graphical, please attach screenshots of the problem. --> Here is a screenshot of Meld Merge that compares two versions of the PCB:  # Steps to reproduce <!-- If there are multiple steps to reproduce it or it is a visual issue, then providing a screen recording as an attachment to this report is recommended. --> <!-- If this issue is specific to a project, please attach the necessary files to this issue. --> 1. Make a copy a PCB file. 2. Start Meld Merge (or other diff program). The copy is of course the same as the original). 3. Open the PCB in KiCad, Make sure units to Mils in the PCB Editor. 4. Select a single pad and press **e** to edit it. 5. Change one of the pad properties, SMT/THT, "Copper layers", pad nr, etc, It does not matter which parameter, and click on **[OK]**. 6. Save the PCB. 7. My diff program (Meld) detects the file change and asks to reload it. 8. After reloading it, rounding errors have appeared in the pad for which the properties have changed. # KiCad Version ``` Application: KiCad PCB Editor Version: 6.0.6-3a73a75311~116~ubuntu20.04.1, release build Libraries: wxWidgets 3.0.4 Platform: Linux 5.15.0-33-generic x86_64, 64 bit, Little endian, wxGTK, xfce, x11 wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24 Boost: 1.71.0 OCC: 7.5.2 Curl: 7.83.1 ngspice: 36 Compiler: GCC 9.4.0 with C++ ABI 1013 Build settings: KICAD_USE_OCC=ON KICAD_SPICE=ON ```