rpc: return a number for estimated_feerate in analyzepsbt

Author: fanquake

src/rpc/rawtransaction.cpp

@@ -2021,7 +2021,7 @@ UniValue analyzepsbt(const JSONRPCRequest& request)
             result.pushKV("estimated_vsize", (int)size);
             // Estimate fee rate
             CFeeRate feerate(fee, size);
-            result.pushKV("estimated_feerate", feerate.ToString());
+            result.pushKV("estimated_feerate", ValueFromAmount(feerate.GetFeePerK()));
         }
         result.pushKV("fee", ValueFromAmount(fee));
 

test/functional/rpc_psbt.py

@@ -355,7 +355,7 @@ def run_test(self):
         assert analyzed['inputs'][0]['has_utxo'] and not analyzed['inputs'][0]['is_final'] and analyzed['inputs'][0]['next'] == 'signer' and analyzed['next'] == 'signer' and analyzed['inputs'][0]['missing']['signatures'][0] == addrinfo['embedded']['witness_program']
 
         # Check fee and size things
-        assert analyzed['fee'] == Decimal('0.001') and analyzed['estimated_vsize'] == 134 and analyzed['estimated_feerate'] == '0.00746268 BTC/kB'
+        assert analyzed['fee'] == Decimal('0.001') and analyzed['estimated_vsize'] == 134 and analyzed['estimated_feerate'] == Decimal('0.00746268')
 
         # After signing and finalizing, needs extracting
         signed = self.nodes[1].walletprocesspsbt(updated)['psbt']