ask_yn works perfectly!

spells/cantrips/ask_yn

@@ -10,15 +10,23 @@ else
     prompt="${question} (y/N)? "
 fi
 
+# Save previous stty config
+old_stty_cfg=$(stty -g)
+
 # Handle Ctrl-C
-trap "printf '\n'; exit 2" 2
+trap "stty '$old_stty_cfg'; printf '\n'; exit 2" 2
 
 # Use stty to make read command work for single character input
-old_stty_cfg=$(stty -g)
 stty raw -echo
 printf "%s" "$prompt" >&2
-answer=$( while ! head -c 1 | grep -i '[yn]'; do true; done )
-stty "$old_stty_cfg" >&2
+while IFS= read -r -n1 answer
+do
+    if [ "$answer" = "" ] || echo "$answer" | grep -iq "^y\|^n"
+    then
+        break
+    fi
+done
+stty "$old_stty_cfg" >&2 # Restore original stty configuration
 
 # If no answer is given, use the default answer
 if [ -z "$answer" ]; then
@@ -27,7 +35,6 @@ fi
 
 # Print the answer and return appropriate exit code
 printf "%s\n" "$(echo $answer | tr a-z A-Z)" >&2
-sleep 0.01 # Without this, answer gets overwritten by next echo
 if [ "$answer" = "Y" -o "$answer" = "y" ]; then
     exit 0
 else