It seems common practice in informal written English (and possibly other languages) to represent emphasised, slow or drawn-out speech by repeating vowels in words:
I was sooooo drunk
How could a writer avoid ambiguity between a vowel sound that is extended in this way and another word that differs only because it already contains a repeated vowel?
For example, the word god, when extended by repeating the O, could easily be confused with the word good.
Is there a better way of representing long vowel sounds than repeating letters?