GH-244 explicitly require Y/N for Command._ask

Author: AlvinRamoutar

src/manage/commands.py

@@ -621,7 +621,7 @@ def _ask(self, fmt, *args, yn_text="Y/n", expect_char="y"):
             resp = input().casefold()
         except Exception:
             return False
-        return not resp or resp.startswith(expect_char.casefold())
+        return not resp or resp == expect_char.casefold()
 
     def ask_yn(self, fmt, *args):
         "Returns True if the user selects 'yes' or confirmations are skipped."