UInt256Parts
data class UInt256PartsXdr(val hiHi: Uint64Xdr, val hiLo: Uint64Xdr, val loHi: Uint64Xdr, val loLo: Uint64Xdr)
XDR Source: struct UInt256Parts { uint64 hi_hi; uint64 hi_lo; uint64 lo_hi; uint64 lo_lo; };
XDR Source: struct UInt256Parts { uint64 hi_hi; uint64 hi_lo; uint64 lo_hi; uint64 lo_lo; };