Returns the greatest integer double value no greater than this.
If this is already an integer valued double, including -0.0, or it is not a finite value, the value is returned unmodified.
For the purpose of rounding, -0.0 is considered to be below 0.0. A number d in the range 0.0 < d < 1.0 will return 0.0.
double floorToDouble();
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https://api.dart.dev/stable/2.5.0/dart-core/double/floorToDouble.html