### Please describe the problem.

Running the test QuickCheck.prop_view_roundtrips fails in a particular case (but only occasionally).

Running the following fails:

[[!format sh """
jkniiv@AINESIS MINGW64 /c/annx
$ ./git-annex.exe test -p 'QuickCheck.prop_view_roundtrips' --quickcheck-replay=258328 --quickcheck-verbose 2>&1 | tee git-annex.test--p-QuickCheck_prop_view_roundtrips.LOG~201
[...]
$ tail -n 50 git-annex.test--p-QuickCheck_prop_view_roundtrips.LOG~201

      Passed:
      AssociatedFile Nothing
      MetaData (fromList [(MetaField "J",fromList []),(MetaField "kk",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\ACK",MetaValue (CurrentlySet False) "2ml",MetaValue (CurrentlySet False) "h",MetaValue (CurrentlySet False) "s\RS",MetaValue (CurrentlySet True) "u",MetaValue (CurrentlySet True) "yp"]),(MetaField "R",fromList [MetaValue (CurrentlySet True) "\NUL",MetaValue (CurrentlySet True) "\EOT",MetaValue (CurrentlySet False) "\r\DC1Fm",MetaValue (CurrentlySet False) "7\DC1~0#",MetaValue (CurrentlySet True) "b"]),(MetaField "Wq",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\USnZ\NAK\NAK"]),(MetaField "z",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "&C0GZ\DLE`",MetaValue (CurrentlySet False) "y",MetaValue (CurrentlySet False) "{\t\CAN\tHJ"])])
      False

      Passed:
      AssociatedFile (Just "\DC3Q\ENQ\SUB#6}9F5\NAK4\ACKQ\ETB;W\vN\ENQ\STXn\EM\ENQFy5\SO(?}qA\v\NAK")
      MetaData (fromList [(MetaField "cK",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\b;D-&\DC3\SOLvs",MetaValue (CurrentlySet True) "-L`vI\EOT",MetaValue (CurrentlySet True) "Lf\NUL%^\ACKY",MetaValue (CurrentlySet True) "Q\ETB\SYN\US"])])
      True

      Passed:
      AssociatedFile (Just "$GC7\nW]\DC16=z\STX]a1)L\NAK[\EOT71`Oi[DT`\SYNU\STXU>/%tEi:\SUBq\EM'Q\CANV\\\RS")
      MetaData (fromList [(MetaField "1",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\njX",MetaValue (CurrentlySet True) "\fpL",MetaValue (CurrentlySet False) "!\ESC@E#r9",MetaValue (CurrentlySet True) "6",MetaValue (CurrentlySet False) "C\tJK)",MetaValue (CurrentlySet True) "{"]),(MetaField "6NS",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) ";\SOs%",MetaValue (CurrentlySet False) "=",MetaValue (CurrentlySet True) "P",MetaValue (CurrentlySet False) "T !\STX\SOH",MetaValue (CurrentlySet False) "f&\NUL,\SUB",MetaValue (CurrentlySet False) "r\SUBi*&)"]),(MetaField "d",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "\RS",MetaValue (CurrentlySet True) "],x\CAN",MetaValue (CurrentlySet False) "c",MetaValue (CurrentlySet False) "n4I\SYN\n,"]),(MetaField "g",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\DC3F\r",MetaValue (CurrentlySet True) "= ",MetaValue (CurrentlySet False) "[",MetaValue (CurrentlySet True) "[Y.",MetaValue (CurrentlySet False) "]",MetaValue (CurrentlySet False) "nPHQ"]),(MetaField "Gb",fromList []),(MetaField "p9",fromList [MetaValue (CurrentlySet False) ""]),(MetaField "Q",fromList []),(MetaField "s9",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\US",MetaValue (CurrentlySet False) ","]),(MetaField "v",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "_q"]),(MetaField "x",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "4",MetaValue (CurrentlySet False) "4\r.\NAKrk",MetaValue (CurrentlySet False) "UNN",MetaValue (CurrentlySet True) "h"])])
      True

      Passed:
      AssociatedFile Nothing
      MetaData (fromList [(MetaField "56",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet False) ")/",MetaValue (CurrentlySet False) ". 8@\SYNQU\DLEl",MetaValue (CurrentlySet True) "2",MetaValue (CurrentlySet False) "nF"]),(MetaField "G",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\r6\NAK{@\NAKn\GS",MetaValue (CurrentlySet False) "\US!> [Y.",MetaValue (CurrentlySet True) "*c\DC37lq\"C",MetaValue (CurrentlySet True) "0",MetaValue (CurrentlySet True) "[@w`kZu",MetaValue (CurrentlySet True) "bw+\ESC"]),(MetaField "HhUjK",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "\NUL=",MetaValue (CurrentlySet True) "\NAKie",MetaValue (CurrentlySet False) ".\DC3+^;\a!s\NAK",MetaValue (CurrentlySet True) "8",MetaValue (CurrentlySet False) "B",MetaValue (CurrentlySet False) "J",MetaValue (CurrentlySet True) "~"]),(MetaField "p7i",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "TO",MetaValue (CurrentlySet False) "gx",MetaValue (CurrentlySet False) "lQqb\SUB:)\ACKX"]),(MetaField "qXr",fromList []),(MetaField "T",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "TF;",MetaValue (CurrentlySet True) "\\DZ",MetaValue (CurrentlySet False) "aOY_6",MetaValue (CurrentlySet True) "{xm;r"]),(MetaField "vOF",fromList [MetaValue (CurrentlySet True) "\DLE",MetaValue (CurrentlySet True) "\DC2L\DC1",MetaValue (CurrentlySet True) "\"|",MetaValue (CurrentlySet False) "H\EOT!3"]),(MetaField "vQ",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "\DLEp",MetaValue (CurrentlySet False) "\CANw#\DEL_G*W0pZ8",MetaValue (CurrentlySet True) "D",MetaValue (CurrentlySet True) "Lx6O\SO=C\\("]),(MetaField "Y",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "\ETB2",MetaValue (CurrentlySet False) "P\v",MetaValue (CurrentlySet False) "d$\SYN"])])
      True

      Passed:
      AssociatedFile (Just "\ESC")
      MetaData (fromList [(MetaField "9CY",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "7y\EOT",MetaValue (CurrentlySet True) "D$\f^\"\r{`",MetaValue (CurrentlySet False) "xpo\SOHq"]),(MetaField "aMO",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\ENQE\at",MetaValue (CurrentlySet True) "\DC4\"1",MetaValue (CurrentlySet True) "7J\n,Z&0j",MetaValue (CurrentlySet False) "T8|3",MetaValue (CurrentlySet False) "UZ",MetaValue (CurrentlySet False) "n\n",MetaValue (CurrentlySet False) "uZ:]K.z~\fa"]),(MetaField "H",fromList [MetaValue (CurrentlySet True) "hEu"]),(MetaField "LbT",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\ENQM7",MetaValue (CurrentlySet False) "\b0F`;",MetaValue (CurrentlySet False) "\CAN\USs",MetaValue (CurrentlySet True) "C",MetaValue (CurrentlySet False) "K",MetaValue (CurrentlySet True) "\\}(g_"]),(MetaField "v",fromList [MetaValue (CurrentlySet True) "ES"])])
      False

      Passed:
      AssociatedFile Nothing
      MetaData (fromList [(MetaField "J",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet False) "b(4G",MetaValue (CurrentlySet False) "bf\"\STXCF\DEL",MetaValue (CurrentlySet True) "i\DC3VB^"]),(MetaField "O",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet False) "\STXAX\US5",MetaValue (CurrentlySet True) "\ESC",MetaValue (CurrentlySet False) "&\GS\DEL\SOH)i\ACK,",MetaValue (CurrentlySet False) "3I4\DLE",MetaValue (CurrentlySet True) "J",MetaValue (CurrentlySet True) "t",MetaValue (CurrentlySet False) "yD6t"]),(MetaField "p",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\EOTM1ZcA",MetaValue (CurrentlySet True) "\nK",MetaValue (CurrentlySet False) ")\GS",MetaValue (CurrentlySet True) ".P'\RSJZ&\DC1\ETB\rz",MetaValue (CurrentlySet False) "1;",MetaValue (CurrentlySet True) "f4Z\SOHr",MetaValue (CurrentlySet False) "gkl"]),(MetaField "XaF",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "@",MetaValue (CurrentlySet False) "H4o?2\\K\EM",MetaValue (CurrentlySet False) "IQ\DC3p"])])
      False

      Failed:
      AssociatedFile (Just "A<#;\SUB\ETB]u v\FS?\bY\SUB9b%\DC4%Ws\\\aJ\FS4\rM\DC1\CAN6g;(TL\US5\\X:l!nFb\ENQ")
      MetaData (fromList [(MetaField "H",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "1=x",MetaValue (CurrentlySet True) ">\STX",MetaValue (CurrentlySet False) "H}9"]),(MetaField "HJ",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\f",MetaValue (CurrentlySet True) "\DC1\DC4Xw{aX",MetaValue (CurrentlySet False) "'\"{",MetaValue (CurrentlySet False) "'9\USKB*\r",MetaValue (CurrentlySet True) "I)\ar",MetaValue (CurrentlySet False) "l"]),(MetaField "m",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\GS#"]),(MetaField "ub",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\DC3{5q9",MetaValue (CurrentlySet False) ")",MetaValue (CurrentlySet False) "C\\!H",MetaValue (CurrentlySet False) "|"])])
      True

      Passed:
      AssociatedFile (Just "A<#;\SUB\ETB]u v\FS?\bY\SUB9b%\DC4%Ws\\\aJ\FS4\rM\DC1\CAN6g;(TL\US5\\X:l!nFb\ENQ")
      MetaData (fromList [(MetaField "H",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "1=x",MetaValue (CurrentlySet True) ">\STX",MetaValue (CurrentlySet False) "H}9"]),(MetaField "HJ",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\f",MetaValue (CurrentlySet True) "\DC1\DC4Xw{aX",MetaValue (CurrentlySet False) "'\"{",MetaValue (CurrentlySet False) "'9\USKB*\r",MetaValue (CurrentlySet True) "I)\ar",MetaValue (CurrentlySet False) "l"]),(MetaField "m",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\GS#"]),(MetaField "ub",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\DC3{5q9",MetaValue (CurrentlySet False) ")",MetaValue (CurrentlySet False) "C\\!H",MetaValue (CurrentlySet False) "|"])])
      False

      *** Failed! Falsified (after 385 tests):
      AssociatedFile (Just "A<#;\SUB\ETB]u v\FS?\bY\SUB9b%\DC4%Ws\\\aJ\FS4\rM\DC1\CAN6g;(TL\US5\\X:l!nFb\ENQ")
      MetaData (fromList [(MetaField "H",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet False) "1=x",MetaValue (CurrentlySet True) ">\STX",MetaValue (CurrentlySet False) "H}9"]),(MetaField "HJ",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\f",MetaValue (CurrentlySet True) "\DC1\DC4Xw{aX",MetaValue (CurrentlySet False) "'\"{",MetaValue (CurrentlySet False) "'9\USKB*\r",MetaValue (CurrentlySet True) "I)\ar",MetaValue (CurrentlySet False) "l"]),(MetaField "m",fromList [MetaValue (CurrentlySet False) "",MetaValue (CurrentlySet True) "\GS#"]),(MetaField "ub",fromList [MetaValue (CurrentlySet True) "",MetaValue (CurrentlySet True) "\DC3{5q9",MetaValue (CurrentlySet False) ")",MetaValue (CurrentlySet False) "C\\!H",MetaValue (CurrentlySet False) "|"])])
      True
      Use --quickcheck-replay=258328 to reproduce.

1 out of 1 tests failed (0.76s)
  (Failures above could be due to a bug in git-annex, or an incompatibility
   with utilities, such as git, installed on this system.)

# End of transcript.
"""]]

If you remove the option `--quickcheck-replay=258328`, the test usually passes.

By the way, if this bug report looks similar to the one I filed in commit 145c343b4 some 9 months back, indeed it is.
I usually disregard these occasional test failures by simply running the tests again because that seems the
path of least resistance. However, I just filed a simple compilation issue + patch today[^1], so I thought this would
be a reasonable thing to do with the same effort involved.

[^1]: [[bugs/commit_7550ef9a2_doesn__39__t_compile_on_Windows--patch]]

### What version of git-annex are you using? On what operating system?

[[!format sh """
git-annex version: 8.20210804-g7550ef9a2
build flags: Assistant Webapp Pairing TorrentParser Feeds Testsuite S3 WebDAV
dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.26 DAV-1.3.4 feed-1.3.0.1 ghc-8.8.4 http-client-0.6.4.1 persistent-sqlite-2.10.6.2 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.1.0
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL X*
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
operating system: mingw32 x86_64
supported repository versions: 8
upgrade supported from repository versions: 2 3 4 5 6 7
"""]]

This is built with the additional patch mentioned in [[bugs/commit_7550ef9a2_doesn__39__t_compile_on_Windows--patch]].

Windows version 21H1 (build 19043.1165), 64 bit.

### Please provide any additional information below.

(The transcript is above. If you need more than the last 50 lines of the test log file, I'm happy to provide it.)

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Git Annex is great. It works with multi-gigabyte backup files (largest around 180GB) via the BLAKE2B160E backend just dandy :)
