fix TestMergeExpose

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

loader/merge_test.go

@@ -1468,11 +1468,6 @@ services:
 				Scale:       1,
 			},
 		},
-		Networks:    types.Networks{},
-		Volumes:     types.Volumes{},
-		Secrets:     types.Secrets{},
-		Configs:     types.Configs{},
-		Extensions:  types.Extensions{},
 		Environment: map[string]string{consts.ComposeProjectName: "test"},
 	}, config)
 }

override/uncity.go

@@ -18,6 +18,7 @@ package override
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/compose-spec/compose-go/format"
@@ -32,6 +33,7 @@ var unique = map[tree.Path]indexer{}
 func init() {
 	unique["services.*.environment"] = environmentIndexer
 	unique["services.*.volumes"] = volumeIndexer
+	unique["services.*.expose"] = exposeIndexer
 }
 
 // EnforceUnicity removes redefinition of elements declared in a sequence
@@ -104,3 +106,14 @@ func volumeIndexer(y any, p tree.Path) (string, error) {
 	}
 	return "", nil
 }
+
+func exposeIndexer(a any, path tree.Path) (string, error) {
+	switch v := a.(type) {
+	case string:
+		return v, nil
+	case int:
+		return strconv.Itoa(v), nil
+	default:
+		return "", fmt.Errorf("%s: unsupported expose value %s", path, a)
+	}
+}