Obisidian has decided that a comma is a separator even when it is within quotation marks. So entering “O Brother, Where Art Thou?” as an alias means that you will end up with two aliases: “O Brother” and “Where Art Thou?”.
But one of the reasons we use quotation marks is precisely to keep a phrase together, or to take into account punctuation marks within a phrase.
I can understand wanting ease of input, and using a comma as a separator, but not when it is within quotation marks!
This breach of yaml standards breaks my vault. I have nearly 2.000 files in need of manual revision because the analysis of the translated title stored as aliases is important.
In v1.4, this divergence from the standard is being addressed.
We will begin with rewriting the incorrect form to a compliant one, when you edit YAML via the properties UI, and eventually (at some point in the future) stop supporting the incorrect format.