* Allow customizing sensor precision
* Don't convert integer strings to floats
* Tweak converting sensor state to number
* Drop default rounding to 2 decimals
* Adjust test
* Tweak rounding, improve test coverage
* Don't convert to a number if not necessary
* Raise if native_precision is set and state is not numeric
* Address review comments
* Address comments, simplify
* Don't call property twice
* Make exception more helpful
