The minecraft:set_written_book_pages item modifier is inconsistent with minecraft:set_name and minecraft:set_lore

The minecraft:set_written_book_pages item modifier is inconsistent with minecraft:set_name and minecraft:set_lore, as the former requires the JSON to be wrapped in a string, while the other two accept text components as-is.

Compare an example of one for minecraft:set_lore:

{
  "function": "minecraft:set_lore",
  "lore": [
    {
      "text": "a text component"
    }
  ]
}

with one for minecraft:set_written_book_pages:

{
  "function": "minecraft:set_written_book_pages",
  "pages": [
    "{\"text\": \"a text component\"}"
  ],
  "mode": "replace_all"
}

This also affects the item stack components themselves, in for example the minecraft:set_components item modifier:

{
  "function": "minecraft:set_components",
  "components": {
    "minecraft:written_book_content": {
      "title": "A Book",
      "author": "Herobrine",
      "pages": [
        "{\"text\": \"a text component\"}"
      ]
    }
  }
}