diff --git a/poc b/poc
index 3cbb239..410c76c 100755
--- a/poc
+++ b/poc
@@ -3,7 +3,7 @@
 
 # constants
 
-MIAOU_BASH_ERROR=$(mktemp -t "$(basename "$0").XXXXXXXX" --tmpdir="/run/user/$(id -u)")
+MIAOU_BASH_ERROR=$(mktemp -t "$(basename "$0").XXXXXXXX" --tmpdir="/run/user/$UID")
 MIAOU_DEBUG=${MIAOU_DEBUG:-false}
 
 declare -A ANSI
@@ -49,14 +49,21 @@ function is_true {
 # example: alias toto="bash -c \"[[ \\\$MIAOU_DEBUG == 'true' ]] && echo yes \\\$* || echo nope\""
 function miaou_debug {
   if is_true "${MIAOU_DEBUG}"; then
+    local compute_hierarchy=true
     [[ ! -v miaou_debug_hierarchy ]] && miaou_debug_hierarchy=0
     local i message="$*" padding=''
     regex='^</' # starts with </
-    [[ $miaou_debug_hierarchy -gt 0 ]] && [[ "${message}" =~ $regex ]] && ((--miaou_debug_hierarchy))
-    for i in $(seq 1 "$miaou_debug_hierarchy"); do padding+='  '; done
+    [[ $miaou_debug_hierarchy -gt 0 ]] &&
+      [[ "${message}" =~ $regex ]] &&
+      ((--miaou_debug_hierarchy)) &&
+      compute_hierarchy=false
+    for ((i = 0; i < miaou_debug_hierarchy; i++)); do padding+='  '; done
     >&4 builtin echo -e "\e[90m <== DEBUG ==> ${padding}\e[33m${message}\e[0m"
-    regex='^<[^/].*[^/]>$' # markup starting
-    [[ "${message}" =~ $regex ]] && ((++miaou_debug_hierarchy)) || true
+    regex='[^/]>$' # does NOT end with />
+    is_true $compute_hierarchy &&
+      [[ "${message}" =~ $regex ]] &&
+      ((++miaou_debug_hierarchy)) ||
+      true
   fi
 }
 
@@ -199,7 +206,7 @@ function dump_failure {
   length_box=$((${#failure_type} + ${#failure_code} + (2 * 2) + 2))
   [[ -v failure_payload ]] && length_box=$((length_box + ${#failure_payload} + (2 * 2) + 1))
   echo -n '╔'
-  for i in $(seq 1 $length_box); do echo -n '═'; done
+  for ((i = 0; i < length_box; i++)); do echo -n '═'; done
   echo '╗'
   echo -n "║ $failure_type "
   [[ -v failure_payload ]] && echo -n ' ' && tty_ansi BG_WHITE FG_BLACK && echo -n "  $failure_payload  " && tty_ansi RESET
@@ -208,9 +215,9 @@ function dump_failure {
   tty_ansi FG_MAGENTA
   echo "║"
   echo -n '╚'
-  for i in $(seq 1 4); do echo -n '═'; done
+  for ((i = 0; i < 4; i++)); do echo -n '═'; done
   echo -n '╦'
-  for i in $(seq $((i + 2)) $length_box); do echo -n '═'; done
+  for ((i = 5; i < length_box; i++)); do echo -n '═'; done
   echo '╝'
   echo "     ║"
   tty_ansi RESET