You see a consistent win for single quotes,
Actually, I don't. In 2 out of the 5 benchmarks, I see "double no $" beat "single no $".
The fact that "double" is slower than "single" comes partially because "single" is one character shorter than "double" (if I add a single space to "single", it takes about 3% longer), and for the rest because processing a backslash in a double quoted string means checking more cases than in a single quoted string.
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