Repetitive use of the same placeholder name in join causes wrong query generation

Here is the code. This table joins ti itself X times to filter out relevant values.

// $left - alias of the left table in the join
// $right - alias of the right table in the join
$query->join('taxonomy_index', $left, "$left.nid = $right.nid AND $right.tid IN (:tids)", array(":tids" => $terms));

If you call it many times in a cycle (with different $terms obviously) the first call arguments will be
used in all subsequent calls. I.e, if you will get something like that if the first value of $terms was array(3):

SELECT DISTINCT n.nid AS nid FROM node n INNER JOIN taxonomy_index ti ON n.nid = ti.nid INNER JOIN taxonomy_index ti1 ON ti.nid = ti1.nid AND ti1.tid IN ('3') INNER JOIN taxonomy_index ti2 ON ti1.nid = ti2.nid AND ti2.tid IN ('3') INNER JOIN taxonomy_index ti3 ON ti2.nid = ti3.nid AND ti3.tid IN ('3') WHERE (n.type = 'my_type') AND (n.status = '1')

This can be workarounded by giving different name to placeholder (i.e :tids1, :tids2 etc ) that is quite normal in a cycle. However, developer shouldn't care about this, because these are not real variables, just placeholder.