> at which point I think it ceases to be "just" Latin script?

I draw my line at 'U'.

I like this metaphor.

Spanish ñ, Catalan or French ç, German ß. Similarly for ł and other Polish letters. It seems strictly speaking the latin alphabet cannot cover many european languages. But mostly we can say latin can express that. You can write "ss" for German and l for Polish, etc, so it can definitely be used. Source: whatssap messages.

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