Correct when entering a Japanese query.
Some Japanese characters are represented by two Unicode characters.
Therefore, non-normalized queries will not hit the DB search.
Normalization makes it a Unicode single character. Then it will hit the search.
irb(main):009:0> "プ".length
=> 2
irb(main):010:0> "プ".length
=> 1
irb(main):011:0> "プ".unicode_normalize.length // character on the first line
=> 1
Correct when entering a Japanese query. Some Japanese characters are represented by two Unicode characters. Therefore, non-normalized queries will not hit the DB search. Normalization makes it a Unicode single character. Then it will hit the search.