truncateToDouble abstract method Null safety
Returns the double integer value obtained by discarding any fractional
digits from the double value of this.
If this is already an integer valued double, including -0.0, or it is a
non-finite double 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 -1.0 < d < 0.0 will return -0.0, and
in the range 0.0 < d < 1.0 it will return 0.0.
Implementation
double truncateToDouble();