@josevalim @Qqwy @OvermindDL1: just pushed new version of ex_calendar.
I added unit behavior, so any developer may easy work only on units. I changed definition of time presentation from protocol to behavior, because I think it will work better here. Calendar is still protocol, so we can list all it’s implementations. Calendar (as in previous version) have method to list supported time presentations and finally time representation have callback to list all supported units. Both time presentation and unit have callbacks to convert from and to universal unit. I added also some method ended with ! character, so we can check or just raise if passed unit name (like :hour) is supported or not. I also updated description and added one more diff method that returns value in universal unit. At end I added translate_units method, so developers do not need to care if they should add 0.5 minute or 30 seconds (I mean: what to use? Float or Integer or any of them? - no matter just translate them).
I hope that I don’t forgot about anything. Maybe some names are still bad (sorry for my English), but I believe that new version of skeleton is now much more better and closer to resolve main problem.
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