Enable ICU4J collations, remove MySQL collation support

Nope, that's exactly what happens.

The original stats came from some data though and, presumably, latin1_swedish_ci doesn't match en_us in all scenarios. Specifically, look at the names (AAA, MMM and ☃) and their collated bytes (wgJCQkIA, wgJOTk4A, wgJbW1sA).

I'm just imagining someone investigating this test in the future, seeing that en_us doesn't match the contents and scratching their heads.