Test seems to fail depending on host filesystem

[DeeUnderscore]

TestFlags() seems to fail depending on what filesystem the repository is checked out to. When doing make test from the repo on an ext4 volume, all tests pass. On the other hand, on a btrfs volume, I get a failure:

    dir_test.go:82: 
                Error Trace:    dir_test.go:82
                Error:          Not equal: 
                                expected: 0
                                actual  : 4096
                Test:           TestFlags
--- FAIL: TestFlags (0.00s)

(this is in both cases with go 1.16.5 on NixOS 21.05, Linux 5.10.37)

This particular test also fails on Hydra, the NixOS build server, with yet different output: https://hydra.nixos.org/build/145014299/nixlog/1

[dundee]

Should be fixed in 5.1.1.

[DeeUnderscore]

Thanks for tagging the release!