values smaller than 0.001 sat/B can't be represented by CFeeRate, but they are not rejected.

```
./src/bitcoin-cli -named sendtoaddress address=bcrt1qwkmhqum095zau5rf2velq55cq938vrd7uw8m4r amount=1.23 fee_rate=0.0009

error code: -6
error message:
Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)
```

```
./src/bitcoin-cli -named sendtoaddress address=bcrt1qwkmhqum095zau5rf2velq55cq938vrd7uw8m4r amount=1.23 fee_rate=0.000000000009

error code: -3
error message:
Invalid amount

return result;
        }
    };
}
#endif 
RPCHelpMan abortrescan();
RPCHelpMan dumpprivkey();
RPCHelpMan importprivkey();
RPCHelpMan importaddress();
RPCHelpMan importpubkey();
RPCHelpMan dumpwallet();
RPCHelpMan importwallet();
RPCHelpMan importprunedfunds();
RPCHelpMan removeprunedfunds();
RPCHelpMan importmulti();
RPCHelpMan importdescriptors();
RPCHelpMan listdescriptors();
Span<const CRPCCommand> GetWalletRPCCommands()
{
static const CRPCCommand commands[] =
{ 
  
    { "rawtransactions",    &fundrawtransaction,             },
    { "wallet",             &abandontransaction,             },
    { "wallet",             &abortrescan,                    },
    { "wallet",             &addmultisigaddress,             },
    { "wallet",             &backupwallet,                   },
    { "wallet",             &bumpfee,                        },
    { "wallet",             &psbtbumpfee,                    },
    { "wallet",             &createwallet,                   },