This can avoid at least one expensive copy for displaying
large blobs with syntax highlighting.
However, we cannot blindly change everything to arrays, either:
the cost of invoking Compress::Raw::Zlib->deflate must be taken
into account. Joining short strings via `.=', `.', `join' or
interpolation is typically faster since it avoids ->deflate
method calls (and non-magic perlops are the fastest dispatches
in Perl).