When i try to perform a query with a numeric remote, i get a database error.
When i explicitly cast it to a string value it works, but the static code analysis fails (as the docblock of the criterion says, that an int is required).

$filter = new Criterion\RemoteId(123);
$this->searchSvc->findSingle($filter);

fails

$filter = new Criterion\RemoteId((string)123);
$this->searchSvc->findSingle($filter);

works

I would suggest at least updating the docblock or doing a type casting inside the constructor to be on the safe side.

I will try to create a pull request, addressing this issue.