That package does not implement C-style escapes. The \v is missing. Furthermore, it looks rather suspect. Observe:

$ echo -n 'v\v\134aa' | perl -e 'use Encode::Escape::ASCII; print deco
+de "ascii-escape", $_ for <>;' | hexdump -C
00000000  76 76 07 61                                       |vv.a|
00000004
[download]

This does not look right to me at all!