Bugfix in ListProperty(), correctly handle list values of length 1

lib/src/db/annotations.dart

Index: lib/src/db/annotations.dart
diff --git a/lib/src/db/annotations.dart b/lib/src/db/annotations.dart
index b1f0f6b5a8bf9684a53feb5cf1cd3de0b2e56da1..e158ad531947da7135c55a163d03e5824a2ce22f 100644
--- a/lib/src/db/annotations.dart
+++ b/lib/src/db/annotations.dart
@@ -258,14 +258,14 @@ class ListProperty extends Property {
     if (value == null) return null;
     List list = value;
     if (list.length == 0) return null;
-    if (list.length == 1) return list[0];
+    if (list.length == 1) return subProperty.encodeValue(db, list[0]);
     return list.map(
         (value) => subProperty.encodeValue(db, value)).toList();
   }
 
   Object decodePrimitiveValue(ModelDB db, Object value) {
     if (value == null) return [];
-    if (value is! List) return [value];
+    if (value is! List) return [subProperty.decodePrimitiveValue(db, value)];
     return (value as List)
         .map((entry) => subProperty.decodePrimitiveValue(db, entry))
         .toList();