documentation for new slice syntax

5.19.4's perldelta says:

    New slice syntax

    The new %hash{...} and %array[...] syntax returns a list of key/value (or
    index/value) pairs.

I have two concerns with this rather terse note: it doesn't specify whether
assignments are possible with this new syntax (assigning more than one
field at once), and there is no reference to further documentation on this
feature.  Presumably it is documented somewhere in perldelta and/or
perlsyn, so could a reference to the document and section be added?

• documentation for new slice syntax by Karen Etheridge
• Re: documentation for new slice syntax by Father Chrysostomos