Spatial index cleanup leads to bad match

Here's an expert from the log (thanks Filipe)

[ns_server:error] [2012-06-26 15:34:14] [n_0@127.0.0.1:<0.4254.0>:compaction_daemon:try_to_cleanup_indexes:399] Error while doing cleanup of old spatial index files for bucket `default`: {exit,
{{badarg,
[{erlang,
binary_to_list,
[{db,
<0.3661.0>,
<0.3662.0>,
nil,
<<"1340721224965520">>,
<0.3658.0>,
<0.3663.0>,

{db_header, 10, 1, <<0,0,0,0, 0,158,0, 0,0,0,0, 70,0,0, 0,0,1,0, 0,0,0,0, 0,0,0,0, 0,124>>, <<0,0,0,0, 0,228,0, 0,0,0,0, 68,0,0, 0,0,1>>, nil, 0, nil, nil}

,
1,
{btree,
<0.3658.0>,

{158, <<0,0,0,0, 1,0,0,0, 0,0,0,0, 0,0,0, 124>>, 70}

,
#Fun<couch_db_updater.7.38096787>,
#Fun<couch_db_updater.8.38096787>,
#Fun<couch_btree.5.88636510>,
#Fun<couch_db_updater.9.38096787>,
1279,
true},
{btree,
<0.3658.0>,

{228, <<0,0,0,0, 1>>, 68}

,
#Fun<couch_db_updater.10.38096787>,
#Fun<couch_db_updater.11.38096787>,
#Fun<couch_db_updater.6.38096787>,
#Fun<couch_db_updater.12.38096787>,
1279,
true},

{btree, <0.3658.0>, nil, #Fun<couch_btree.3.88636510>, #Fun<couch_btree.4.88636510>, #Fun<couch_btree.5.88636510>, nil, 1279, true}

,
1,
<<"default/master">>,
"/Users/fdmanana/couchbase2-4/ns_server/couch/0/default/master.couch.1",
[],
nil,

{user_ctx, null, [], undefined}

,
nil,
[before_header,
after_header,
on_file_open],
[]}],
[]},
{couch_server,
open_db,
4,
[

{file, "couch_server.erl"}

,

{line, 449}

]},
{gen_server,
handle_msg,
5,
[

{file, "gen_server.erl"}

,

{line, 588}

]},
{proc_lib,
init_p_do_apply,
3,
[

{file, "proc_lib.erl"}

,

{line, 227}

]}]},
{gen_server,
call,
[couch_server,
{open,
{db,
<0.3661.0>,
<0.3662.0>,
nil,
<<"1340721224965520">>,
<0.3658.0>,
<0.3663.0>,

{db_header, 10, 1, <<0,0,0,0, 0,158,0, 0,0,0,0, 70,0,0, 0,0,1,0, 0,0,0,0, 0,0,0,0, 0,124>>, <<0,0,0,0, 0,228,0, 0,0,0,0, 68,0,0, 0,0,1>>, nil, 0, nil, nil}

,
1,
{btree,
<0.3658.0>,

{158, <<0,0,0,0, 1,0,0,0, 0,0,0,0, 0,0,0, 124>>, 70}

,
#Fun<couch_db_updater.7.38096787>,
#Fun<couch_db_updater.8.38096787>,
#Fun<couch_btree.5.88636510>,
#Fun<couch_db_updater.9.38096787>,
1279,
true},
{btree,
<0.3658.0>,

{228, <<0,0,0,0, 1>>, 68}

,
#Fun<couch_db_updater.10.38096787>,
#Fun<couch_db_updater.11.38096787>,
#Fun<couch_db_updater.6.38096787>,
#Fun<couch_db_updater.12.38096787>,
1279,
true},

{btree, <0.3658.0>, nil, #Fun<couch_btree.3.88636510>, #Fun<couch_btree.4.88636510>, #Fun<couch_btree.5.88636510>, nil, 1279, true}

,
1,
<<"default/master">>,
"/Users/fdmanana/couchbase2-4/ns_server/couch/0/default/master.couch.1",
[],
nil,

{user_ctx, null, [], undefined}

,
nil,
[before_header,
after_header,
on_file_open],
[]},
[]},
infinity]}}}
[{gen_server,call,3,[

{file,"gen_server.erl"}

,

{line,188}

]},
{couch_server,open,2,[

{file,"couch_server.erl"}

,

{line,55}

]},
{couch_spatial_group,open_db_group,2,
[

{file,"src/geocouch/couch_spatial_group.erl"}

,

{line,342}

]},
{couch_spatial,open_db_group,2,
[

{file,"src/geocouch/couch_spatial.erl"},{line,77}]},
{couch_spatial,get_group_server,2,
[{file,"src/geocouch/couch_spatial.erl"}

,

{line,66}

]},
{couch_spatial,get_group_info,2,
[

{file,"src/geocouch/couch_spatial.erl"}

,

{line,118}

]},
{capi_spatial,'get_signatures/1-fun-0',2,
[

{file,"src/capi_spatial.erl"}

,

{line,186}

]},
{lists,map,2,[

{file,"lists.erl"}

,

{line,1173}

]}]