code: public static Constraint min(final Number min) {
  		return new Constraint("min", minPayload(min)) {
  			public boolean isValid(Object actualValue) {
  				return actualValue == null || (actualValue instanceof Number && min != null &&
  						min.longValue() <= ((Number) actualValue).longValue());
  			}
  		};
  	}
docs: The 'min' constraint - field must contain a number larger than or equal to min.
  @param min the minimum value
  @return constraint