Fix omitempty support for floats.

encode_test.go

@@ -190,6 +190,12 @@ var marshalTests = []struct {
 			A struct{ X, y int } "a,omitempty,flow"
 		}{struct{ X, y int }{0, 1}},
 		"{}\n",
+	}, {
+		&struct {
+			A float64 "a,omitempty"
+			B float64 "b,omitempty"
+		}{1, 0},
+		"a: 1\n",
 	},
 
 	// Flow flag
@@ -340,7 +346,7 @@ var marshalErrorTests = []struct {
 	panic: `Duplicated key 'b' in struct struct \{ B int; .*`,
 }, {
 	value: &struct {
-		A       int
+		A int
 		B map[string]int ",inline"
 	}{1, map[string]int{"a": 2}},
 	panic: `Can't have key "a" in inlined map; conflicts with struct field`,

yaml.go

@@ -324,13 +324,15 @@ func isZero(v reflect.Value) bool {
 		return v.Len() == 0
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 		return v.Int() == 0
+	case reflect.Float32, reflect.Float64:
+		return v.Float() == 0
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 		return v.Uint() == 0
 	case reflect.Bool:
 		return !v.Bool()
 	case reflect.Struct:
 		vt := v.Type()
-		for i := v.NumField()-1; i >= 0; i-- {
+		for i := v.NumField() - 1; i >= 0; i-- {
 			if vt.Field(i).PkgPath != "" {
 				continue // Private field
 			}