Patrick Steinhardt [off-list ref] writes:

The subject reads "skip EXPENSIVE test that is broken without
SIZE_T_IS_32BIT", but we need to add prerequisite for 64BIT,
wouldn't it be more accurate to say without SIZE_T_IS_64BIT?

That is, the test is broken with SIZE_T_IS_32BIT, no?

...
-test_expect_success EXPENSIVE 'filter large file' '
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'filter large file' '
 	test_config filter.largefile.smudge cat &&
 	test_config filter.largefile.clean cat &&
 	test_seq -f "%1048576d" 1 2048 >2GB &&