In general I am always confused that it lets you use strings unquoted, which is what allows for all these issues with ambiguity of the interpreted data type, Norway problem and all that.
It also just looks odd to me, I don't see why it's necessary to allow this.
It’s great for end users who don’t understand what a string is or don’t have to play the game of finding the hanging single quote when they write the file by hand in a textarea.
On the opposite end of UX, there’s hand written JSON which is just too meticulous in some scenarios when people are writing config without editor support.
That’s probably a good thing for end users but if it’s running on something that affects the live service I’d rather not have people edit the config who don’t know what a string is
Dealing with inline quotes is annoying, but if you care about users writing things by hand, and especially in a textarea, you should not be using a format that depends on indentation.
It also just looks odd to me, I don't see why it's necessary to allow this.