id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
5242	IntMap.differenceKeysSet for removing an IntSet of keys	liyang	fox@ucw.cz	"Currently, {{{IntMap.difference ma mb}}} removes all the keys in `mb` from `ma`, where the elements of the two `IntMap`s can be of different types; the elements of `mb` are not used.

There is no efficient way to remove an `IntSet` of keys, however. These patches adds the `IntMap.differenceKeysSet` function—essentially a copy/paste of `difference`—that satisfies the following property:
{{{
prop_DiffKeysSet :: Map Int -> Map () -> Bool
prop_DiffKeysSet t1 t2
  = difference t1 t2 == differenceKeysSet t1 (keysSet t2)
}}}"	feature request	closed	normal	7.6.1	libraries (other)	7.1	wontfix	containers	hackage.haskell.org@… johan.tibell@…	Unknown/Multiple	Unknown/Multiple	None/Unknown