Possible regression in grep 3.10

[Felix Yan]

Hello,

I noticed a possible regression in the update of grep 3.9 -> 3.10:

"\d" inside a square bracket [] no longer matches against ASCII digits.

3.9:
$ echo 123 | grep -P '[\d]'
123

3.10:
$ echo 123 | grep -P '[\d]'

This effectively broke my scripts, and doesn't seem to be mentioned in 
the changelog (which only covers multibyte digits).

--
Regards,
Felix Yan

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