cue: decode empty list as empty slice instead of slice-typed nil

Signed-off-by: Artem V. Navrotskiy <[email protected]>

Author: bozaro

cue/decode.go

@@ -280,6 +280,9 @@ func (d *decoder) interfaceValue(v Value) (x interface{}) {
 		for list.Next() {
 			a = append(a, d.interfaceValue(list.Value()))
 		}
+		if a == nil {
+			a = []interface{}{}
+		}
 		x = a
 
 	case StructKind:

cue/decode_test.go

@@ -231,6 +231,10 @@ func TestDecode(t *testing.T) {
 				`,
 		dst: &S{},
 		err: "Decode: x: cannot use value 1 (type int) as (string|bytes)",
+	}, {
+		value: `[]`,
+		dst:   new(interface{}),
+		want:  []interface{}{},
 	}}
 	for _, tc := range testCases {
 		t.Run(tc.value, func(t *testing.T) {