Error Using double cell value

[gonojuarez]

I suggest changing the following code `class DoubleCellValue extends CellValue { final double value;

const DoubleCellValue(this.value);

@override String toString() { return value.toString(); }

@override int get hashCode => Object.hash(runtimeType, value);

@override operator ==(Object other) { return other is DoubleCellValue && other.value == value; } }`

the value.toString return null

I suggest to change to this format:

`class DoubleCellValue extends CellValue { final double value;

const DoubleCellValue(this.value);

@override String toString() { return '${value}'; }

@override int get hashCode => Object.hash(runtimeType, value);

@override operator ==(Object other) { return other is DoubleCellValue && other.value == value; } }`