Fork of lines.love for browsing read-only text files; useful starting point for further forks

establish a fairly fundamental invariant

This commit doesn't guarantee we'll always catch it. But if this invariant is violated, things can get quite difficult to debug. I found in the Lua Carousel fork that all the xpcalls I keep around were actively hindering my ability to notice this invariant being violated.

Created by  akkartik  on November 24, 2023
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