Is there a manual that can walk us through and show us what changes, including examples? This would really help us developers. Then a separate manual showing the indeed new stuff. Because we not only have one hurdle but two. We have the hurdle of making sure our old code works with the new build. Then we have an additional larger hurdle that will take longer time of learning new functionalities from MQL5. Let's not kid ourselves: MQL4 above 509 is an entirely different language from MQL4 build 509 and before. A much more complex language than MQL4 is. And for developers like me who have ONLY CODED in MQl4, we don't know what classes and the other new terms mean. We don't necessarily code other languages or for Microsoft.
It is not beyond belief when you understand what those values mean.
To summarize, the modelling quality of a backtest is calculated based on how many of the bar states used were derived from real prices. Obviously on a 1 minute chart backtest, only the HLOC of each bar can be considered real prices, the rest of the ticks are artificially modelled by the strategy tester. On higher timeframe backtests, HLOC from the lower timeframes are included so there are a lot more "real" prices used per bar in the backtest. Therfore modelling quality of tests on higher timeframe charts get a higher modelling quality value.
99% on M1 and higher TFs is achievable with tick-data backtest using ... ah, sorry, no advertising. ;)