In `/src/applications/project/query/PhabricatorProjectSearchEngine.php`, change the two only uses of `PhabricatorSearchIntField` to `->setIsHidden(false)`. Then go to `/project/query/advanced/` and enter example values into the `Maximum Depth` and `Maximum Depth` fields and click the Search button.* Make sure that `rPfbe07fbeefcadea3abdb4dc3e4d4558c2b91ada9` is included
* Go to `/maniphest/query/advanced/` and enter example values into the `Page Size` field and click the Search button - get `Integer value for "Page Size" can not be parsed.` now for invalid example values.
* In `/src/applications/project/query/PhabricatorProjectSearchEngine.php`, change the two only uses of `PhabricatorSearchIntField` to `->setIsHidden(false)`. Then go to `/project/query/advanced/` and enter example values into the `Maximum Depth` and `Maximum Depth` fields and click the Search button.
* Example values: `13`, `0`, `-13`, `foobar`, `foo13bar`, `-foo1313`, `13.5`, `-13.5`, `13,5`, `-13,5`, `-`, `-0` (the latter is still accepted as `0`).
It seems that there are no API calls to test - `/conduit/method/project.query/` does not offer passing depth values* API call `/conduit/method/project.query/` does not offer passing depth values to test.
* API call for `/conduit/method/maniphest.search/` and entering a non-integer value as `limit` triggers an error **but** this code path does not call `PhabricatorSearchIntField.php` at all, so this is unrelated and a separate issue.