My experience is the following. Names and prices changed, essence remains untouched.
I set a trade of Asset A at an "Ask" price of 1. Gradually it becomes the "Lowest Ask". At that moment the "Market History" section reports trades executed at "Ask" price of 1.5, which is not the "Lowest". So, it is easy to conclude that there is either a bug there, or someone was just inflating the price.
Now since you mentioned a rounding issue as known, never mind if irrelevant to my experience, I just underlined the fact that traders do not like trade engines which produce unexpected results.
That's all and thank you for your time.
Thanks. Without knowing the details (volume, assets involved) of the trade that happened at 1.5 it is impossible to tell if the rounding issue is the cause.
What I take from this is that we're talking about a UI issue here. Your point that this is unexpected and leads to confusion is absolutely valid. I do not see this as a bug in the market engine, though, but merely as a display problem.
Edit: added comment to github issue https://github.com/cryptonomex/graphene/issues/460#issuecomment-236355266
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