Here's an updated refleak run, on master as of last Thursday:

test_atexit leaked [12, 12, 12] references, sum=36
test_atexit leaked [4, 6, 6] memory blocks, sum=16
test_capi leaked [6, 6, 6] references, sum=18
test_capi leaked [2, 4, 4] memory blocks, sum=10
test_asyncio leaked [4, 1, 1] memory blocks, sum=6
test_concurrent_futures leaked [822, 807, 810] references, sum=2439
test_concurrent_futures leaked [274, 271, 272] memory blocks, sum=817
test_import leaked [-2, 2, 0] references, sum=0
test_import leaked [-2, 4, 2] memory blocks, sum=4
test_logging leaked [-21, 1, 1] memory blocks, sum=-19
test_os leaked [6, 7, 7] memory blocks, sum=20
test_platform leaked [12, 12, 12] references, sum=36
test_platform leaked [4, 6, 6] memory blocks, sum=16
test_sys leaked [9, 9, 9] references, sum=27
test_sys leaked [3, 5, 5] memory blocks, sum=13
test_threading leaked [12, 12, 12] references, sum=36
test_threading leaked [4, 6, 6] memory blocks, sum=16
test_xml_etree_c leaked [6, -6, 0] references, sum=0
test_xml_etree_c leaked [1, 1, 2] memory blocks, sum=4
test_multiprocessing_spawn leaked [159, 180, 162] references, sum=501
test_multiprocessing_spawn leaked [54, 62, 55] memory blocks, sum=171

I ran this one with `-j0` which may have affected the results slightly, but shaved 40 minutes off the run time.