Unable to unmarshal BoolVal to Yempty (GNMIEncoding)

[cho-m]

Currently in ytypes/leaf.go, the gNMIToYANGTypeMatches and sanitizeGNMI functions do not support yang.Yempty.

A simple testcase to check this:

$ git diff
diff --git a/ytypes/leaf_test.go b/ytypes/leaf_test.go
index 8d0181a..00ce92d 100644
--- a/ytypes/leaf_test.go
+++ b/ytypes/leaf_test.go
@@ -1657,6 +1657,16 @@ func TestUnmarshalLeafGNMIEncoding(t *testing.T) {
                        },
                        wantVal: &LeafContainerStruct{BoolLeaf: ygot.Bool(true)},
                },
+               {
+                       desc:     "success gNMI BoolVal to Yempty",
+                       inSchema: typeToLeafSchema("empty-leaf", yang.Yempty),
+                       inVal: &gpb.TypedValue{
+                               Value: &gpb.TypedValue_BoolVal{
+                                       BoolVal: true,
+                               },
+                       },
+                       wantVal: &LeafContainerStruct{EmptyLeaf: YANGEmpty(true)},
+               },
                {
                        desc:     "success gNMI StringVal to Ystring",
                        inSchema: typeToLeafSchema("string-leaf", yang.Ystring),

Test result:

--- FAIL: TestUnmarshalLeafGNMIEncoding (0.00s)
    leaf_test.go:1848: success gNMI BoolVal to Yempty: unmarshalLeaf(&{<nil> <nil> empty-leaf    [] Leaf unset <nil> unset map[]  0xc00042efc0 [] <nil> <nil> [] [] [] [] map[] [] map[] map[] <nil>}, &{<nil> [] <nil> <nil> <nil> <nil> <nil> <nil> <nil> <nil> [] <nil> <nil> 0 <nil> <nil> false [] []}, bool_val:true , GNMIEncoding): got err=failed to unmarshal &{true} into empty, want err=nil
E0706 17:29:38.442149   18766 util_types.go:170] unexpected type bits in yangBuiltinTypeToGoPtrType
FAIL
exit status 1
FAIL	github.com/openconfig/ygot/ytypes	0.063s