Date: "Every day this week"
I thought I found an undocumented feature in Todoist when I entered "ev day this week" in the date field of a task, and Todoist intelligently expanded it to "Every day this week". But when I marked the task as Done on the first day, it disappeared and didn't show up on the next day's agenda.
When I tried it again, I noticed that Todoist added a week to the date when the task was completed. It seems like Todoist interprets "Every day this week" to mean "every week on this day". It's a simple enough misunderstanding, and it's not a big deal, but the it was puzzling the first time it happened.
This is just an unexpected behavior report rather than a feature request or plea for help.