switch ( _type ) {
case TCDouble: return [NSString stringWithFormat:@"%.1lf", *(double *)[self value]];
case TCFloat: return [NSString stringWithFormat:@"%.1f", *(float *)[self value]];
switch ( _type ) {
case TCDouble: return [NSString stringWithFormat:@"%.1lf", *(double *)[self value]];
case TCFloat: return [NSString stringWithFormat:@"%.1f", *(float *)[self value]];