roundingFN property
Set the function for rounding the values when set.
Other examples:
Math.floorfn(x) { // do your own rounding logic // return x; }
@default Math.round
Implementation
_i2.num Function(_i2.num)? get roundingFN => (_i2.num p0) => _i4.callMethod(
      _i4.getProperty(
        this,
        'roundingFN',
      ),
      r'call',
      [
        this,
        p0,
      ],
    );