range method
Implementation
@override
String range(
num min,
num max, {
bool includeMin = true,
bool includeMax = true,
}) {
final leftBracket = includeMin ? '[' : '(';
final rightBracket = includeMax ? ']' : ')';
return 'Value must be in the range $leftBracket$min, $max$rightBracket';
}