diff --git a/lib/Pogo/Engine/Namespace.pm b/lib/Pogo/Engine/Namespace.pm
index 81359ef..2ef6b28 100644
--- a/lib/Pogo/Engine/Namespace.pm
+++ b/lib/Pogo/Engine/Namespace.pm
@@ -244,6 +244,8 @@ sub fetch_all_slots
   {
     $hostslots{$hostname} = [];
 
+    #$DB::single = 1;
+
     foreach my $app ( @{ $hostinfo->{apps} } )
     {
       foreach my $envtype ( keys %{ $hostinfo->{envs} } )
@@ -267,10 +269,10 @@ sub fetch_all_slots
               }
               push @{ $hostslots{$hostname} }, $slot;
 
-              next unless exists $const->{$app} and
-                          exists $const->{$app}->{$envtype};
+              next unless exists $const->{$envtype} and
+                          exists $const->{$envtype}->{$app};
 
-              my $concur = $const->{$app}->{$envtype};
+              my $concur = $const->{$envtype}->{$app};
               if ( $concur !~ m{^(\d+)%$} )
               {
                 # not a percentage, a literal
@@ -425,6 +427,8 @@ sub set_conf
 
   delete $conf_in->{envs};
 
+  #$DB::single = 1;
+
   # constraint processing
   foreach my $c_env_type ( keys %{ $conf_in->{constraints} } )
   {
@@ -467,9 +471,8 @@ sub set_conf
         # $second requires $first to go first within $env
         # $first is a predecessor of $second
         # $second is a successor of $first
-        # we just make sure these exist, don't define them
-        $conf->{seq}->{pred}->{$c_env_type}->{$second}->{$first};
-        $conf->{seq}->{succ}->{$c_env_type}->{$first}->{$second};
+        $conf->{seq}->{pred}->{$c_env_type}->{$second}->{$first} = 1;
+        $conf->{seq}->{succ}->{$c_env_type}->{$first}->{$second} = 1;
       }
     }
 
@@ -628,7 +631,7 @@ sub get_cur
 {
   my ( $self, $app, $key ) = @_;
   my $c = store->get( $self->{path} . "/conf/cur/$app/$key" );
-  return $c;
+  return JSON->new->utf8->allow_nonref->decode($c);
 }
 
 sub get_curs
@@ -648,6 +651,23 @@ sub get_all_curs
   return { map { $_ => $self->get_curs($_) } store->get_children($path) };
 }
 
+sub app_members {
+  my $self = shift;
+  my $app  = shift;
+
+  my $path = $self->{path} . "/conf/apps/$app";
+  return store->get_children("$path");
+}
+
+sub env_members {
+  my $self      = shift;
+  my $envtype   = shift;
+  my $envvalue  = shift;
+
+  my $path = $self->{path} . "/conf/envs/$envtype/$envvalue";
+  return store->get_children("$path");
+}
+
 sub get_all_seqs
 {
   my $self = shift;
@@ -920,8 +940,8 @@ Env settings:
 
 Sequences:
 
-    /pogo/ns/nsname/conf/seq/pred/coast/frontend: []
-    /pogo/ns/nsname/conf/seq/succ/coast/backend: []
+    /pogo/ns/nsname/conf/seq/pred/coast/frontend/backend
+    /pogo/ns/nsname/conf/seq/succ/coast/backend/frontend
 
 And even the plugin gets stored:
 
diff --git a/t/13_unit_constrained.t b/t/13_unit_constrained.t
index b947a4b..77e53e4 100644
--- a/t/13_unit_constrained.t
+++ b/t/13_unit_constrained.t
@@ -49,7 +49,7 @@ use File::Basename;
 use Pogo::Engine::Store qw(store);
 use Data::Dumper;
 
-# Log::Log4perl->easy_init({ level => $DEBUG, layout => "%F{1}-%L-%M: %m%n" });
+Log::Log4perl->easy_init({ level => $DEBUG, layout => "%F{1}-%L-%M: %m%n" });
 
 my $ns = Pogo::Engine::Namespace->new(
   nsname   => "wonk",
@@ -135,29 +135,30 @@ my $job = Pogo::Engine::Job->new({
     exe_data    => "wonk",
 });
 
+$job->start(
+     sub { ok 0, "err cont on start(): @_" },
+     sub { ok 1, "success cont on start()"; 
+           my($nqueued, $nwaiting) = @_;
+           is($nqueued, 4, "4 hosts enqueued");
+           is($nwaiting, 0, "0 hosts waiting");
+         },
+);
+
 $ns->fetch_runnable_hosts( 
     $job, 
     $host_meta,
     sub { die "err cont: ", Dumper( \@_ ); },
     sub { $result = \@_;
+          print "result=", Dumper( \@_ );
         },
 );
 
 ok(1, "at the end" );
 
-# print store->_dump();
+print store->_dump();
 
 __END__
 
-$job->start(
-     sub { ok 0, "err cont on start(): @_" },
-     sub { ok 1, "success cont on start()"; 
-           my($nqueued, $nwaiting) = @_;
-           is($nqueued, 4, "4 hosts enqueued");
-           is($nwaiting, 0, "0 hosts waiting");
-         },
-);
-
 print Dumper($result);
 
 __END__
diff --git a/t/conf/example.yaml b/t/conf/example.yaml
index 7b2c63a..46b58fa 100644
--- a/t/conf/example.yaml
+++ b/t/conf/example.yaml
@@ -10,6 +10,8 @@ apps:
   backend:
     - bar[1-10].east.example.com
     - bar[1-10].west.example.com
+  tail:
+    - zar[1-10].west.example.com
 
 envs:
   coast:
@@ -26,4 +28,4 @@ constraints:
       - frontend: 25%
       - backend: 1
     sequence:
-      - [ backend, frontend ]
+      - [ backend, frontend, tail ]