One more related question: are these three regular expression literals equivalent?
1. `/[💩-💫]/u`: raw astral symbols
2. `/[\u{1F4A9}-\u{1F4AB}]/u`: astral symbols represented using Unicode code
point escape sequences
3. `/[\uD83D\uDCA9-\uD83D\uDCAB]/u`: astral symbols represented as a surrogate
pair
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