make the parameter codec include defaulters

staging/src/k8s.io/apimachinery/pkg/runtime/codec.go

@@ -139,6 +139,7 @@ func NewParameterCodec(scheme *Scheme) ParameterCodec {
 		typer:     scheme,
 		convertor: scheme,
 		creator:   scheme,
+		defaulter: scheme,
 	}
 }
 
@@ -147,6 +148,7 @@ type parameterCodec struct {
 	typer     ObjectTyper
 	convertor ObjectConvertor
 	creator   ObjectCreater
+	defaulter ObjectDefaulter
 }
 
 var _ ParameterCodec = &parameterCodec{}
@@ -163,9 +165,17 @@ func (c *parameterCodec) DecodeParameters(parameters url.Values, from schema.Gro
 	}
 	for i := range targetGVKs {
 		if targetGVKs[i].GroupVersion() == from {
-			return c.convertor.Convert(&parameters, into, nil)
+			if err := c.convertor.Convert(&parameters, into, nil); err != nil {
+				return err
+			}
+			// in the case where we going into the same object we're receiving, default on the outbound object
+			if c.defaulter != nil {
+				c.defaulter.Default(into)
+			}
+			return nil
 		}
 	}
+
 	input, err := c.creator.New(from.WithKind(targetGVKs[0].Kind))
 	if err != nil {
 		return err
@@ -173,6 +183,10 @@ func (c *parameterCodec) DecodeParameters(parameters url.Values, from schema.Gro
 	if err := c.convertor.Convert(&parameters, input, nil); err != nil {
 		return err
 	}
+	// if we have defaulter, default the input before converting to output
+	if c.defaulter != nil {
+		c.defaulter.Default(input)
+	}
 	return c.convertor.Convert(input, into, nil)
 }