Seen in the introduction to a book entitled 日本語文法ハンドブック, so it would greatly surprise me if it's a typo. Each section in the book is broken into parts and one is entitled "これだけは", being described here:


The end of the sentence is a Vてある construction, but uses を instead of が or は. My understanding is that this is not correct. Is this a typo, or a usage I'm not familiar with?


が~Vてある is used to describe a state that comes from completing V. を~Vてある is used to indicate that V has been completed in preparation for something. In your case, it's that the information has been provided for your edification.

The table from here helps show the two usages of Vてある (though I think it's wrong that ~Vている can only be for intransitive verbs): てあります

And here are some examples, pulled from here and the previous link:



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