bug: Inconsistent Uppercasing errors

[lukasmwerner]

Given this document:

#problem[
	4. Find all the $x$ values where the following function is discontinuous.
]

#solution[
	$x=-2,0,3$
]

#aside[
	at $x=-2$ jump discontinuity. 
        // this "at" doesn't get flagged

	at $x=0$ infinite discontinuity.
	// this "at" does `This sentence doesn't start with a capital letter`

	at $x=3$ removable discontinuity. (can be removed via re-defining the domain to exclude that)
        // this "at" does `This sentence doesn't start with a capital letter`
]

The errors seem indicate that the first sentence isn't being picked up as a new sentence but rather as a continuation of the math from the previous block.

[elijah-potter]

This may be related to #228

[grantlemons]

Ok, this is because there is an unlintable token immediately before, which the sentence capitalization rule respects because unlintable things can occur in the middle of a sentence.