Leverage UNKNOWN pseudo-type

Author: phansys

ibm_db2.stub.php

@@ -27,7 +27,7 @@ function db2_pconnect(string $database, ?string $username, ?string $password, ar
 /**
  * @param resource $connection
  */
-function db2_autocommit($connection, ?int $value = null): int|bool {}
+function db2_autocommit($connection, int $value = UNKNOWN): int|bool {}
 
 /**
  * @param resource $connection
@@ -177,22 +177,22 @@ function db2_execute_many($stmt, array $options = []): int|false {}
 /**
  * @param resource $stmt
  */
-function db2_stmt_errormsg($stmt = null): string {}
+function db2_stmt_errormsg($stmt = UNKNOWN): string {}
 
 /**
  * @param resource $stmt
  */
-function db2_stmt_error($stmt = null): string {}
+function db2_stmt_error($stmt = UNKNOWN): string {}
 
 /**
  * @param resource $connection
  */
-function db2_conn_errormsg($connection = null): string {}
+function db2_conn_errormsg($connection = UNKNOWN): string {}
 
 /**
  * @param resource $connection
  */
-function db2_conn_error($connection = null): string {}
+function db2_conn_error($connection = UNKNOWN): string {}
 
 /**
  * @param resource $stmt