I actually failed a technical interview relatively recently because of this.

It was a fullstack position with some Ruby scripts here and there mostly centered around scheduling. Had a leetcode style takehome that requested I build out a pretty simple reservation system with time off and quarter hours and stuff like that.

I boot up into the leetcode environment and was surprised at just how many things were Rails-specific, rather than being in the ruby STD lib. Completely threw me off since I suddenly had to figure out how to wrestle the Date STD lib to work for me, and anything date/time related is my personal hell :)