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// - The "Illustrations" tab goes to "/tags/tag/illustrations". The API is
// "/ajax/search/illustrations/TAG?type=illust_and_ugoira". This seems to give identical
// results to "artworks".
Not identical results.
Try updating to r93.
Now manga works are shown in "type: all" search mode.
Manga and ugoira are not shown in "type: illustrations" search mode, only manga works are shown in "type: manga" search mode.
It's normal. But something another are indicated in the comments of the script.
Manga works are not shown in "type: all" search mode.