I imagine BrowserUk is using vec
See Re: vec overflow?, Re: searching a vector array, Re^2: Array vs. Hash for sparsely integer-indexed data (bit vectors)
This takes about 33MB of ram,
perl -e " my $f='' ; vec($f, 2**28,1)=1; "
I think that's marking as seen (as duplicate) the id 268435456 or 268_435_456
I think BrowserUk is probably assuming a minimum starting id, 268_435_456 is a lot of IDs :) 256MiB
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