chicken@love$ ls
??10??8.30 ??7??8.34  0.0.1      0.0.3      8.??5??6   8.32??3??
??7??8.28  ??7??8.36  0.0.2      0.0.4      8.3??e??5
chicken@love$ csi

CHICKEN
(c) 2008-2013, The Chicken Team
(c) 2000-2007, Felix L. Winkelmann
Version 4.8.0.3 (stability/4.8.0) (rev 091c3d9)
netbsd-unix-gnu-x86-64 [ 64bit manyargs dload ptables ]
compiled 2013-03-12 on aeryn.xorinia.dim (Darwin)

#;1> (use posix)
; loading /usr/pkg/lib/chicken/6/posix.import.so ...
; loading library posix ...
#;2> (directory)
("0.0.1" "0.0.2" "0.0.3" "0.0.4" "8.\r\n5\r\n6" "\r\n7\r\n8.36" "8.3\r\ne\r\n5" "\r\n7\r\n8.34" "8.32\r\n3\r\n" "\r\n10\r\n8.30" "\r\n7\r\n8.28")

The funny directories are all empty.

Meanwhile, the release-info for netstring reads:

(release "0.0.1")
(release "0.0.2")
(release "0.0.3")
(release "0.0.4")

Ergo, all four releases are available, so henrietta-cache won't "fix it on the next run", but the extra \r\n files upset henrietta (presumably when it looks for the latest version in the directory?)