John Lees-Miller ea2d76de51 Improve tagging for a (maybe) null error (#12) ... * Document a way of handling an error that might be null * Make typecheck strict * Test some edge cases Co-authored-by: Jakob Ackermann <jakob.ackermann@overleaf.com>		2020-09-11 10:05:54 +01:00
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o-error	Improve tagging for a (maybe) null error (#12)	2020-09-11 10:05:54 +01:00