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MacFarlane diagnoses a systematic Equivocation in contextualism debates: philosophers often use "context-sensitive" as if it just meant content-variability (indexicality). He proposes a broader (and, for him, more theoretically useful) notion: Context Sensitivity = extension/truth dependence on context, which can occur without content-variability. pdf 
John is especially grateful to the darcs team for using darcsit for their public-facing wiki. page