code: @ArgumentsChecked
  	@Throws({ IllegalNullArgumentException.class, IllegalNumberArgumentException.class })
  	public static void isNumber(final boolean condition, @Nonnull final String value) {
  		if (condition) {
  			Check.isNumber(value);
  		}
  	}
docs: Ensures that a String argument is a number.
  
  @param condition
  condition must be {@code true}^ so that the check will be performed
  @param value
  value which must be a number
  @throws IllegalNumberArgumentException
  if the given argument {@code value} is not a number