We now always render both first and last links in case the page returned is navigable, which essentially means: whenever the result spans across more than one page. I.e. whenever either a next or prev link will be rendered, both first and last links are rendered, too.
Clients can still reason about the fact whether they're on the first or last page by the non-presence of prev (indicates you're on the first page) or next (indicates you're on the last page).
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