Method negate

src/jvm/clojure/lang/Numbers.java:1058–1063

(Number x)

	//public Number subtract(Number x, Number y);
	final public Number negate(Number x){
		MathContext mc = (MathContext) MATH_CONTEXT.deref();
		return mc == null
		       ? ((BigDecimal) x).negate()
		       : ((BigDecimal) x).negate(mc);
	}

	public Number inc(Number x){
		MathContext mc = (MathContext) MATH_CONTEXT.deref();