The collection params accessed via that filter appear to describe the available query params but are not actually used in the query.
I think what you actually want is the rest_{$this->post_type}_query
filter which allows you to modify the args before they are passed to WP_Query::query()
.
Also keep in mind that on the API request the per_page
arg might be set, but internally that is translated to posts_per_page
for the actual query args.
Edit: I think I misread the original question…
The rest_{$this->post_type}_collection_params
does indeed describe the available params.
You should be able to set the per_page
max at $params['per_page']['maximum']
.
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