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@Zippie
Yes, I wouldn't worry about cracks either unless the casing is splitting too, and/or it starts to bulge anywhere, in which case I would replace it ASAP.
I have had lots of deep cuts in my tyres - down to the casing and if they become too open I glue them using 'superglue gel', deflating the tyre and pinch the cut together again - I usually do a check every couple of weeks and dig any bits of glass out as well.
If the casing is damaged in any significant way, certainly if it is bulging, though replace ASAP as it will blow out at some point, probably soon.