@mhoye On the one hand, yeah. On the other hand, I sort of feel for YAML because it's trying to be friendly and not force you to quote strings all the time (or otherwise mark things as being strings instead of whatever).
(Our Grafana dashboards once went wrong with 'guess the type of this', because our SSD serial numbers looked like '<digits>E<more digits>', so that's obviously a float in exponential notation, right? I only noticed because some serial numbers became '∞'.)