alter self seems to assume that the caster is a humanoid, otherwise it would be called "humanoid shape" or something.
does alter self work the same regardless of the caster's creature type?
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Yes. I suspect that it's called that* because the rules are written with humanoid PCs in mind - having a dragon in-world refer to it as form of the humanoid would be interesting, though. ^_^
*It's also one of the spells inherited from third edition D&D, so the name is a legacy of a world without the polymorph subtype.