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95a84ad655
Our previous modelling did not account for the fact that a lookahead can potentially extend all the way to the end of the input (and similarly, that a lookbehind can extend all the way to the beginning). To fix this, I extended `firstPart` and `lastPart` to handle lookbehinds and lookaheads correctly, and added some test cases (all of which yield no new results). Fixes #20429.