Re: [bug #36567] grep -i (case-insensitive) is broken with UTF8

[Jim Meyering]

Jim Meyering wrote:
...
>> I've implemented the above, and have begun testing.
>> The testing exposed an additional problem with -F.
>> This fails both with and without the complication of multi-byte:
>>
>>     $ i='\xC4\xB0'
>>     $ printf "$i$i$i$i$i$i$i\n" > in
>>     $ LC_ALL=C grep "$i" in || echo FAIL
>>     FAIL

That was merely PEBKAC ;-)
Of course the 6-byte xC4xB0 fails to match those Turkish I's.
I was viewing the search string via:

  echo "$i"

when I should have been doing it like this:

  printf '%s\n' "$i"