Fixed ensure consistent $expire casting

[dilipbheda]

Trac ticket: https://core.trac.wordpress.org/ticket/63364

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[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 60206
GitHub commit: 0aa29fd

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.