a few months ago (before 1.13) and today, I was trying to get a villager to offer me a mending book. according to everything I've seen so far, the books offered should be randomly enchanted with equal weights assigned to each item, and it was taking me so long to get to mending (like, Minecraft weeks) that I started taking stats, and I've seen every book except mending so far in the chart, most of them (including Infinity, which I use to gauge against Mending, considering how valuable both of them are) more than four times each. I'm pretty sure it's not a statistical anomaly. I'm using a setup where I take away a librarian's workstation and put it back down to refresh his trades every few seconds. I've been running it for probably a cumulative five or six hours.
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Since its a treasure enchantment (like frost walker - meaning you can't just regularly enchant stuff with these) so its probably intentionally rare
I recently did a mending hunt in 1.12.1 and obtained it after a few hours of grinding. I can say though that the odds of mending is not equal to all other books, that is definitely not the case on Bedrock. Iām not sure about 1.13.0 though. I may try to obtain it again and see if I can also verify this.