Removed excessive casts (#1452)

Removed excessive casts

Author: DamirAinullin

Dapper/SqlMapper.cs

@@ -646,7 +646,7 @@ public static IDataReader ExecuteReader(this IDbConnection cnn, CommandDefinitio
         /// <param name="commandType">The type of command to execute.</param>
         /// <remarks>Note: each row can be accessed via "dynamic", or by casting to an IDictionary&lt;string,object&gt;</remarks>
         public static IEnumerable<dynamic> Query(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null) =>
-            Query<DapperRow>(cnn, sql, param as object, transaction, buffered, commandTimeout, commandType);
+            Query<DapperRow>(cnn, sql, param, transaction, buffered, commandTimeout, commandType);
 
         /// <summary>
         /// Return a dynamic object with properties matching the columns.
@@ -659,7 +659,7 @@ public static IEnumerable<dynamic> Query(this IDbConnection cnn, string sql, obj
         /// <param name="commandType">The type of command to execute.</param>
         /// <remarks>Note: the row can be accessed via "dynamic", or by casting to an IDictionary&lt;string,object&gt;</remarks>
         public static dynamic QueryFirst(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null) =>
-            QueryFirst<DapperRow>(cnn, sql, param as object, transaction, commandTimeout, commandType);
+            QueryFirst<DapperRow>(cnn, sql, param, transaction, commandTimeout, commandType);
 
         /// <summary>
         /// Return a dynamic object with properties matching the columns.
@@ -672,7 +672,7 @@ public static dynamic QueryFirst(this IDbConnection cnn, string sql, object para
         /// <param name="commandType">The type of command to execute.</param>
         /// <remarks>Note: the row can be accessed via "dynamic", or by casting to an IDictionary&lt;string,object&gt;</remarks>
         public static dynamic QueryFirstOrDefault(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null) =>
-            QueryFirstOrDefault<DapperRow>(cnn, sql, param as object, transaction, commandTimeout, commandType);
+            QueryFirstOrDefault<DapperRow>(cnn, sql, param, transaction, commandTimeout, commandType);
 
         /// <summary>
         /// Return a dynamic object with properties matching the columns.
@@ -685,7 +685,7 @@ public static dynamic QueryFirstOrDefault(this IDbConnection cnn, string sql, ob
         /// <param name="commandType">The type of command to execute.</param>
         /// <remarks>Note: the row can be accessed via "dynamic", or by casting to an IDictionary&lt;string,object&gt;</remarks>
         public static dynamic QuerySingle(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null) =>
-            QuerySingle<DapperRow>(cnn, sql, param as object, transaction, commandTimeout, commandType);
+            QuerySingle<DapperRow>(cnn, sql, param, transaction, commandTimeout, commandType);
 
         /// <summary>
         /// Return a dynamic object with properties matching the columns.
@@ -698,7 +698,7 @@ public static dynamic QuerySingle(this IDbConnection cnn, string sql, object par
         /// <param name="commandType">The type of command to execute.</param>
         /// <remarks>Note: the row can be accessed via "dynamic", or by casting to an IDictionary&lt;string,object&gt;</remarks>
         public static dynamic QuerySingleOrDefault(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null) =>
-            QuerySingleOrDefault<DapperRow>(cnn, sql, param as object, transaction, commandTimeout, commandType);
+            QuerySingleOrDefault<DapperRow>(cnn, sql, param, transaction, commandTimeout, commandType);
 
         /// <summary>
         /// Executes a query, returning the data typed as <typeparamref name="T"/>.