Add \dNNN Decimal Escape Sequences to Python String Literals

It’s technically a breaking change (like adding \e for \x1b):

>>> print("\d65")
<python-input-0>:1: SyntaxWarning: invalid escape sequence '\d'
\d65
>>> print("\d10")
<python-input-1>:1: SyntaxWarning: invalid escape sequence '\d'
\d10

See also Please don't break invalid escape sequences.

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