mysqli::fetch_fields does not return false

According to PHP source code (both 7 & 8) this function never returns false. It can only return an array.

resources/functionMap.php

@@ -7239,7 +7239,7 @@
 'mysqli_fetch_assoc' => ['array<string,string>|null', 'result'=>'mysqli_result'],
 'mysqli_fetch_field' => ['object|false', 'result'=>'mysqli_result'],
 'mysqli_fetch_field_direct' => ['object|false', 'result'=>'mysqli_result', 'fieldnr'=>'int'],
-'mysqli_fetch_fields' => ['array|false', 'result'=>'mysqli_result'],
+'mysqli_fetch_fields' => ['array', 'result'=>'mysqli_result'],
 'mysqli_fetch_lengths' => ['array|false', 'result'=>'mysqli_result'],
 'mysqli_fetch_object' => ['object|null', 'result'=>'mysqli_result', 'class_name='=>'string', 'params='=>'?array'],
 'mysqli_fetch_row' => ['array|null', 'result'=>'mysqli_result'],
@@ -7290,7 +7290,7 @@
 'mysqli_result::fetch_assoc' => ['array<string,string>|null'],
 'mysqli_result::fetch_field' => ['object|false'],
 'mysqli_result::fetch_field_direct' => ['object|false', 'fieldnr'=>'int'],
-'mysqli_result::fetch_fields' => ['array|false'],
+'mysqli_result::fetch_fields' => ['array'],
 'mysqli_result::fetch_object' => ['object|null', 'class_name='=>'string', 'params='=>'array'],
 'mysqli_result::fetch_row' => ['array|null'],
 'mysqli_result::field_seek' => ['bool', 'fieldnr'=>'int'],