How to pass a bool type parameter to a stored procedure using Dapper?

Question

Oracle

var parameters = new DynamicParameters();
parameters.Add("PARAM1", true, DbType.Boolean);
parameters.Add("PARAM2", null, DbType.Decimal, ParameterDirection.Output, 0);

DbConnection.Execute("PROC_BOOL", parameters, null, null, CommandType.StoredProcedure);

The procedure doesn't work.