Whenever I invoke $image->hash() to get the SHA-1 hash of the image file,
I instead get back a ref to the internal Image.pm $self->{'HASH'} hash
where we store fields from the DB. At least this is the case on FreeBSD 10.3
(perl 5.20). Some odd interation with the AUTOLOAD function?

Anyway, just use $image->field('hash') instead.