Code completion result for source line:
public function __construct(private ?|) {
(QueryType=COMPLETION, prefixSearch=true, caseSensitive=true)
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KEYWORD    array                                      null
KEYWORD    bool                                       null
KEYWORD    callable                                   null
KEYWORD    float                                      null
KEYWORD    int                                        null
KEYWORD    iterable                                   null
KEYWORD    mixed                                      null
KEYWORD    object                                     null
KEYWORD    string                                     null