Use \hbox_unpack_(drop|clear):N whichever is available
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`\hbox_unpack_clear:N` was renamed to `\hbox_unpack_drop:N` in 2019, but some distributions still ship older versions of expl3, so use "drop" if it's available, and fall back to "clear" if not.
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\hbox_unpack_clear:Nwas renamed to\hbox_unpack_drop:Nin 2019, but some distributions still ship older versions of expl3, so use "drop" if it's available, and fall back to "clear" if not.