static MathExpr read(final DataInput in) throws IOException {
		final byte[] data = new byte[readInt(in)];
		in.readFully(data);
		return parse(new String(data, UTF_8));
	}
Simplifies {@code this} expression by applying the default
{@link #REWRITER}.

@return a newly created math expression object
jenetics.prog/src/main/java/io/jenetics/prog/op/MathExpr.java