One must be careful with the ${\foo} because if foo returns something that isn't a simple scalar value then you
might get unexpected results.
To be more precise, the \ operator gives its
argument list context, which may surprise
many people (it did me). The other interpolation construct
@{[ ]} also provides list context. This
is something to be aware of, and use of scalar
will be appropriate in some cases, including in
${\scalar foo}.
Abigail
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