Code completion result for source line:
function union_types(int|\Test\UnionTypes|null $param): null|||\Test\UnionTyes1
(QueryType=COMPLETION, prefixSearch=true, caseSensitive=true)
PACKAGE    Test                            [PUBLIC]   null
CLASS      UnionTypes1                     [PUBLIC]   Test
CLASS      UnionTypes2                     [PUBLIC]   Test
------------------------------------
KEYWORD    array                                      null
KEYWORD    bool                                       null
KEYWORD    callable                                   null
KEYWORD    false                                      null
KEYWORD    float                                      null
KEYWORD    int                                        null
KEYWORD    iterable                                   null
KEYWORD    null                                       null
KEYWORD    object                                     null
KEYWORD    string                                     null
KEYWORD    true                                       null