How do the following ViewHelper work in the new version TYPO3 8.4.0?

1¶

{objects -> f:count()}

my output is always 1 or 0

2¶

<f:widget.paginate objects="{blogs}" as="paginatedBlogs" configuration="{itemsPerPage: 5, insertAbove: 1, insertBelow: 0, maximumNumberOfLinks: 10}">
use {paginatedBlogs} as you used {blogs} before, most certainly inside
a <f:for> loop.
</f:widget.paginate>

my output is only the first page