I used to think that too. But it doesn’t really help that much, because interpolation is fairly obvious with syntax highlighting. I changed my mind and I prefer consistency, and have every string the same. Also, if you need to add or remove interpolation then you don’t have to change the type of quotes.
At the end of the day, let the tools enforce this nonsense, but I'm still a performance wonk at some level and it drives me crazy seeing interpolatable strings without interpolations.
I was told about a ruby project years ago where they gained a measurable performance boost by converting all the strings without interpolation to single quotes.
That's a vague anecdote so should be taken with a pinch of salt. Even if it was once the case VM often improve to fix these edge cases.
So I was just wondering if there was anything more formal to prove this so that I can avoid this preconception I've been carrying around for years based on nothing more than someone's now dated Lightning Talk.
That seems like a good enough reason to always use double " for consistency to me.