asBoolOrNull function

Implementation

bool? asBoolOrNull(Object? v) {
  if (v == null) return null;
  if (v is bool) return v;
  if (v is String) {
    final s = v.toLowerCase().trim();
    if (s == 'true' || s == '1') return true;
    if (s == 'false' || s == '0') return false;
  }
  if (v is num) return v != 0;
  return null;
}