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File handles can be opened to "in memory" files held
in Perl scalars via:
open($fh, ">", \$variable)
Always on Perls where it is no longer experimental
Sometimes, such as when I deem the syntax to be clearer with it than without
Only if the existing code base uses it or a standards doc mandates it
Never heard of it
I'm still supporting 5.6.0, you insensitive clod!
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