It is 12288.
And this is a very good question. I have no answer. I see this number for the first time 
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Yes, but that only applies to someone who is using both zram and swap, correct? If you are only using zram, zswap shouldn’t be engaging.
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Is there a limit to the amount of zram one could use? 32GB, for instance?
no there is no limit
I don’t think you can over 100% of physical ram 
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Ha.