fix: can search for numeric strings in a collection's child string prop

fixes #12

Author: pdevito3

QueryKit.IntegrationTests/Tests/DatabaseFilteringTests.cs

@@ -71,6 +71,37 @@ public async Task can_filter_by_string_for_collection()
         recipes[0].Id.Should().Be(fakeRecipeOne.Id);
     }
 
+    [Fact]
+    public async Task can_filter_by_numeric_string_for_collection()
+    {
+        // Arrange
+        var testingServiceScope = new TestingServiceScope();
+        var faker = new Faker();
+        var fakeIngredientOne = new FakeIngredientBuilder()
+            .WithName("abc123")
+            .Build();
+        var fakeRecipeOne = new FakeRecipeBuilder().Build();
+        fakeRecipeOne.AddIngredient(fakeIngredientOne);
+        
+        var fakeIngredientTwo = new FakeIngredientBuilder()
+            .WithName(faker.Lorem.Sentence())
+            .Build();
+        var fakeRecipeTwo = new FakeRecipeBuilder().Build();
+        fakeRecipeTwo.AddIngredient(fakeIngredientTwo);
+        await testingServiceScope.InsertAsync(fakeRecipeOne, fakeRecipeTwo);
+        
+        var input = $"""Ingredients.Name @=* "123" """;
+
+        // Act
+        var queryableRecipes = testingServiceScope.DbContext().Recipes;
+        var appliedQueryable = queryableRecipes.ApplyQueryKitFilter(input);
+        var recipes = await appliedQueryable.ToListAsync();
+
+        // Assert
+        recipes.Count.Should().Be(1);
+        recipes[0].Id.Should().Be(fakeRecipeOne.Id);
+    }
+    
     [Fact]
     public async Task can_filter_by_string_for_collection_with_count()
     {

QueryKit/FilterParser.cs

@@ -171,7 +171,7 @@ private static Expression CreateRightExprFromType(Type leftExprType, string righ
         var targetType = leftExprType;
         if (isEnumerable)
         {
-            if (int.TryParse(right, out var intVal))
+            if (int.TryParse(right, out var intVal) && targetType.GetGenericArguments().All(arg => arg != typeof(string)))
             {
                 // supports collection count
                 return Expression.Constant(intVal, typeof(int));