Was pondering this for a while, what would be the affect if a tiny or large caster (or any size other than small or medium for that matter) cast alter self? Are their only choices small and medium forms, or does their innate size come into play somehow, and if so, how?
Strictly by the rules, their choices are small and medium regardless of original size.
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Creatures smaller than small or larger than medium get an additional set of size modifiers when polymorphed, though, found here.