/usr/lib/x86_64-linux-gnu/libref_array.so is in libref-array-dev 0.3.0.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libref_array.so.1.1.0
/usr/lib/x86_64-linux-gnu/libref_array.so.1.1.0