Thread:Extension talk:Scribunto/'Equal' character used in template parameter messes things: bug or feature?/reply (3)

Thank you both. Now I understand the problem, but I still don't see the solution I should apply. I'm aiming to have feature parity with w:Template:Flagicon and ideally one day we could just rename it, changing all the backend without need to touch any call to this template in wiki pages. The "size=" paramater is optional, so I can't just reserve a place for it. Editors have typed simply "size=" thousands of times. How can I keep that behavior?