Is there a distinction between doubting the proposition that a sentence expresses, and doubting what proposition that sentence expresses? It seems to me that there is, but that is a distinction that threatens to be collapsing under your defence of KILPOD.
...There might be cases where it really is not clear even to experts whether the x should be classed as an ant or a termite, and there one might think that it is actually the meaning of the terms that is is being brought into question as well, but that is a very specific kind of case.
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