Why does get_next() return a real day for the incorrect cron expression? ('0 0 0 1 0')

[leemurus]

On wikipedia, day cannot be 0. https://en.wikipedia.org/wiki/Cron. Why do you allow?

[kiorky]

related to #6, seees there is another cornercase, i'm looking at it.

[kiorky]

it's not for days but to support seconds repeat where in this case, fields are then shifted up to 6 and the 4th field becomes the day one.

As this case is pretty straightforward, i added some rule to check in in the new released croniter==1.2.0

Believe me, cron corner cases are infinite and using misformed crontabs expression will still always give you opportunity for bad ranges.