Funny - I do it exactly the opposite. I use singles unless I need double, because then interpolating happens only when I say so, and I otherwise don't have to pay attention to sigils or other special characters. When interpolation happens, then I have to scan the line to figure out if I want to go and escape everything, or if I leave it as-is, and use the concatentation operator '.'. As far as obviousness, I suggest a syntax-highlighting editor. ;-)
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