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> \d now matches Unicode digits such as ᭕ (a Balinese five) and ๓ (a Thai three).

This sounds like a disaster waiting to happen.

It has been like that since forever (at least since 5.10, 2007). To only match 0-9, use [0-9] or /\d/a (/a is available since 5.14, 2011).

How, exactly?