These are normal IN mechanics – it matches anything in set, not all of set combined.
Type of match you want is called tag_slug__and in WP query arguments. You can see code that generates SQL for it in source of WP_Query->&get_posts() method.
Resulting SQL is like this:
SELECT p.ID
FROM wp_posts p
INNER JOIN wp_term_relationships tr ON (p.ID = tr.object_id)
INNER JOIN wp_term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id)
INNER JOIN wp_terms t ON (tt.term_id = t.term_id)
WHERE tt.taxonomy = 'post_tag'
AND t.slug IN ('is', 'filler')
GROUP BY p.ID HAVING count(p.ID) = 2
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