most compact number representation

libdevcore/CommonJS.h

@@ -38,7 +38,10 @@ template <unsigned S> std::string toJS(FixedHash<S> const& _h)
 
 template <unsigned N> std::string toJS(boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N, N, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> const& _n)
 {
-	return "0x" + toHex(toCompactBigEndian(_n, 1));
+	std::string h = toHex(toCompactBigEndian(_n, 1));
+	// remove first 0, if it is necessary;
+	std::string res = h[0] != '0' ? h : h.substr(1);
+	return "0x" + res;
 }
 
 inline std::string toJS(bytes const& _n, std::size_t _padding = 0)