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| For all users:                                     |
| This Firefish fork now requires PGroonga           |
| (https://pgroonga.github.io/),                     |
| so PLEASE INSTALL AND ENABLE IT BEFORE UPGRADING!! |
|                                                    |
| For the detailed explanation, see:                 |
| https://post.naskya.net/notes/9ldi29amfanomef5     |
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