/// Convert u256 into user-readable string. Returns int/hex value of 64 bits int, hex of 160 bits FixedHash. As a fallback try to handle input as h256.
std::stringprettyU256(u256_n);
std::stringprettyU256(u256_n,bool_abridged=true);
/// Convert h256 into user-readable string (by directly using std::string constructor).
std::stringfromRaw(h256_n,unsigned*_inc=nullptr);
/// Convert string to Address (h160), returns empty address if (_a.size != 40).