Imply lenient deserialization when using snake_case

Author: mythz

src/ServiceStack.Text/Common/DeserializeTypeRefJson.cs

@@ -35,7 +35,8 @@ internal static object StringToType(ReadOnlySpan<char> strType,
             var typeAttr = config.TypeAttrMemory;
 
             object instance = null;
-            var lenient = config.PropertyConvention == PropertyConvention.Lenient;
+            var textCase = typeConfig.TextCase.GetValueOrDefault(config.TextCase);
+            var lenient = config.PropertyConvention == PropertyConvention.Lenient || textCase == TextCase.SnakeCase;
 
             for (; index < strTypeLength; index++) { if (!JsonUtils.IsWhiteSpace(buffer[index])) break; } //Whitespace inline
 

src/ServiceStack.Text/Common/DeserializeTypeRefJsv.cs

@@ -32,7 +32,7 @@ internal static object StringToType(ReadOnlySpan<char> strType,
             var config = JsConfig.GetConfig();
 
             object instance = null;
-            var lenient = config.PropertyConvention == PropertyConvention.Lenient;
+            var lenient = config.PropertyConvention == PropertyConvention.Lenient || config.TextCase == TextCase.SnakeCase;
 
             var strTypeLength = strType.Length;
             while (index < strTypeLength)

src/ServiceStack.Text/TypeConfig.cs

@@ -14,6 +14,15 @@ internal class TypeConfig
         internal FieldInfo[] Fields;
         internal Func<object, string, object, object> OnDeserializing;
         internal bool IsUserType { get; set; }
+        internal Func<TextCase> TextCaseResolver;
+        internal TextCase? TextCase 
+        {
+            get
+            {
+                var result = TextCaseResolver?.Invoke();
+                return result is null or Text.TextCase.Default ? null : result;
+            }
+        }
 
         internal TypeConfig(Type type)
         {
@@ -77,7 +86,9 @@ public static Func<object, string, object, object> OnDeserializing
 
         static TypeConfig Create()
         {
-            config = new TypeConfig(typeof(T));
+            config = new TypeConfig(typeof(T)) {
+                TextCaseResolver = () => JsConfig<T>.TextCase
+            };
 
             var excludedProperties = JsConfig<T>.ExcludePropertyNames ?? TypeConstants.EmptyStringArray;
 

tests/ServiceStack.Text.Tests/JsConfigTests.cs

@@ -131,7 +131,6 @@ public void TestCloneObjectWithJsConfigLocal()
         {
             JsConfig.TextCase = TextCase.Default;
             JsConfig<TestObject>.TextCase = TextCase.SnakeCase;
-            JsConfig.PropertyConvention = PropertyConvention.Lenient;
 
             AssertObject();