Testing more types

ExcelORM/ExcelORMTests/TestTypes.cs

@@ -7,4 +7,9 @@ public record TestTypes
     public TimeSpan? TimeSpan { get; set; }
     public int? Int { get; set; }
     public double? Double { get; set; }
+    public decimal? Decimal { get; set; }
+    public long? Long { get; set; }
+    public short? Short { get; set; }
+    public float? Float { get; set; }
+    public byte? Byte { get; set; }
 }