[timeline] posts sometimes get duplicated

[trinkey]

from what i can tell this only happens to posts that were initially prepended? seems to be very difficult to reproduce and happens at seemingly random times

[trinkey]

i haven't done any testing but this might be caused by float rounding issues

[trinkey]

it in fact should have nothing to do with float issues because js uses 64 bit floats which can represent integers up to 2^53