prompt_length cleanup

internal/wizard.zsh

@@ -110,20 +110,19 @@ local -ra rainbow_right=(
 )
 
 function prompt_length() {
-  local COLUMNS=1024
+  local -i COLUMNS=1024
   local -i x y=$#1 m
   if (( y )); then
     while (( ${${(%):-$1%$y(l.1.0)}[-1]} )); do
       x=y
-      (( y *= 2 ));
+      (( y *= 2 ))
     done
-    local xy
     while (( y > x + 1 )); do
-      m=$(( x + (y - x) / 2 ))
-      typeset ${${(%):-$1%$m(l.x.y)}[-1]}=$m
+      (( m = x + (y - x) / 2 ))
+      (( ${${(%):-$1%$m(l.x.y)}[-1]} = m ))
     done
   fi
-  REPLY=$x
+  typeset -g REPLY=$x
 }
 
 function print_prompt() {