Update WebServiceProxy.

Author: gk-brown

kilo-client/src/main/java/org/httprpc/kilo/WebServiceProxy.java

@@ -57,6 +57,7 @@
 import java.util.UUID;
 
 import static org.httprpc.kilo.util.Collections.*;
+import static org.httprpc.kilo.util.Iterables.*;
 import static org.httprpc.kilo.util.Optionals.*;
 
 /**
@@ -902,7 +903,7 @@ private static List<Object> getParameterValues(Object argument) {
 
             return list;
         } else if (argument instanceof Collection<?> collection) {
-            return listOf(map(collection, WebServiceProxy::getParameterValue));
+            return listOf(mapAll(collection, WebServiceProxy::getParameterValue));
         } else {
             return listOf(getParameterValue(argument));
         }