Work around lacking robustness of isEqual() and isSame() functions

Hi,

extremely small changes due to rounding already result in `isEqual()` and `isSame()` returning false. For example when I export a shape as a `.step` file and import it again it's not considered the same anymore.

I'm hoping for suggestions on how to work around this! One idea was to compare parameters like area and center of mass and consider two shapes equal if the difference between those parameters is very small. If someone has a better idea please suggest it to me. Thanks!