code: public static BigFloat abs(BigFloat x) {
  		if (x.isSpecial())
  			return x.isInfinity() ? POSITIVE_INFINITY : NaN;
  		return x.context.valueOf(x.value.abs());
  	}
docs: Returns the {@link BigFloat} that is the <code>abs(this)</code> (absolute value).
  
  @param x the value to make absolute
  
  @return the resulting {@link BigFloat}
  
  @see BigDecimal#abs(MathContext)