Fix the paginator not detecting the first or last page correctly during
sequential pagination.
Caused by the fact that we fetch one more record than needed to detect
whether we're on the last page, then throw that record away by
overriding Rails' internal `records` method. An upstream refactoring
meant that the `size` method now counts the number of records *after*
the extra record is thrown away, where before it counted *before* the
extra record was thrown away.
cae6599631