Remove UTF8 BOM when deserializing as well

Author: mythz

src/ServiceStack.Text/DefaultMemory.cs

@@ -494,7 +494,7 @@ private static object Deserialize(MemoryStream ms, bool fromPool, Type type,
             try
             {
                 var charsWritten = Encoding.UTF8.GetChars(bytes, 0, (int) ms.Length, utf8, 0);
-                var ret = deserializer(type, new ReadOnlySpan<char>(utf8, 0, charsWritten));
+                var ret = deserializer(type, new ReadOnlySpan<char>(utf8, 0, charsWritten).WithoutBom());
                 return ret;
             }
             finally

src/ServiceStack.Text/NetCoreMemory.cs

@@ -141,7 +141,7 @@ public override async Task<object> DeserializeAsync(Stream stream, Type type, De
 
         private static object Deserialize(MemoryStream memoryStream, bool fromPool, Type type, DeserializeStringSpanDelegate deserializer)
         {
-            var bytes = memoryStream.GetBufferAsSpan();
+            var bytes = memoryStream.GetBufferAsSpan().WithoutBom();
             var chars = CharPool.GetBuffer(Encoding.UTF8.GetCharCount(bytes));
             try
             {