We also need better support for non C locales in tsearch. As I was porting mysql's sakila sample database I was reminded just how painful it is when you initdb in a non-supported locale (which is probably the default on the majority of distros out there)
In 8.2 tsearch2 supports utf8...
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
