This is definitely a failing of yaml. Though, I feel that generally it's the sort of thing you learn once the hard way, then it sticks with you pretty well.
Also I'm glad there are more anti-toml folks are out there, feels like I'm taking crazy pills when people say it is "simple" and "elegant". IMO it's uglier than old-school ini format - at least it's more strictly defined but that doesn't really sway me to convert
elegant, human readable, indentation sensitive language that's great for deep nesting but has some weird idiosyncrasies with some dynamically typed parsers being too smart for their own good