Case Insensitive Comparison with Postgres 12

[Igal Sapir]

I am trying to test a simple case insensitive comparison.  Most likely the
collation that I chose is wrong, but I'm not sure how to choose the correct
one (for English/US?).  Here is my snippet:

create collation case_insensitive(
    provider=icu, locale='en-US-x-icu', deterministic=false
);
select 'Abc' = 'abc' collate case_insensitive;

I expected true but am getting false.

Any thoughts?

Thanks,

Igal