Why en_US.UTF-8 locale consider a < A?

[Xin Li]

Hi,

I recently noticed that when LANG and LC_CTYPE are set to en_US.UTF-8,
the following file:

%%%%%
1
2
A
a
B
b
%%%%

I got:

$ LANG=C LC_CTYPE=C sort testcase
1
2
A
B
a
b
$ LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 sort testcase
1
2
a
A
b
B

Is this result correct?  It matches some Debian behavior but not macOS
behavior.

Cheers,

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