fix(config)!: apply a property max depth only to the property and its paths

QueryKit.UnitTests/PropertyDepthTests.cs

@@ -257,7 +257,7 @@ public void filter_root_property_allowed_when_max_depth_is_0()
     }
 
     [Fact]
-    public void filter_per_property_max_depth_applies_to_a_property_that_starts_with_its_name()
+    public void filter_per_property_max_depth_does_not_apply_to_a_property_that_starts_with_its_name()
     {
         var input = """AddressBackup.State == "x" """;
         var config = new QueryKitConfiguration(settings =>
@@ -267,11 +267,12 @@ public void filter_per_property_max_depth_applies_to_a_property_that_starts_with
         });
 
         var act = () => FilterParser.ParseFilter<Owner>(input, config);
-        act.Should().NotThrow();
+        act.Should().Throw<QueryKitPropertyDepthExceededException>()
+            .WithMessage("*AddressBackup.State*depth of 1*maximum allowed depth of 0*");
     }
 
     [Fact]
-    public void sort_per_property_max_depth_applies_to_a_property_that_starts_with_its_name()
+    public void sort_per_property_max_depth_does_not_apply_to_a_property_that_starts_with_its_name()
     {
         var input = "AddressBackup.State";
         var config = new QueryKitConfiguration(settings =>
@@ -281,7 +282,7 @@ public void sort_per_property_max_depth_applies_to_a_property_that_starts_with_i
         });
 
         var act = () => SortParser.ParseSort<Owner>(input, config);
-        act.Should().NotThrow();
+        act.Should().Throw<QueryKitPropertyDepthExceededException>();
     }
 
     private class Owner

QueryKit/QueryKitPropertyMappings.cs

@@ -412,11 +412,12 @@ private static string GetOperator(ExpressionType nodeType)
         if (string.IsNullOrEmpty(propertyPath))
             return null;
 
-        // Check if the property path starts with any configured property that has MaxDepth
+        // Check if the property path is, or is under, any configured property that has MaxDepth
         foreach (var mapping in _propertyMappings.Values)
         {
-            if (mapping.MaxDepth.HasValue &&
-                propertyPath.StartsWith(mapping.Name ?? "", StringComparison.OrdinalIgnoreCase))
+            if (mapping.MaxDepth.HasValue && !string.IsNullOrEmpty(mapping.Name) &&
+                (propertyPath.Equals(mapping.Name, StringComparison.OrdinalIgnoreCase) ||
+                 propertyPath.StartsWith(mapping.Name + ".", StringComparison.OrdinalIgnoreCase)))
             {
                 return mapping.MaxDepth;
             }

README.md

@@ -787,6 +787,8 @@ var config = new QueryKitConfiguration(config =>
 // "Publisher.Address.City" throws (depth 2, exceeds global limit of 1)
 ```
 
+The override applies only to the property and the paths below it. For example, `HasMaxDepth` on `Address` does not apply to `AddressBackup.State`, so `AddressBackup.State` uses the global limit.
+
 **Depth Calculation:**
 - `Title` = depth 0 (root property)
 - `Author.Name` = depth 1 (one level of nesting)