/usr/lib/x86_64-linux-gnu/libref_array.so is in libref-array-dev 0.5.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libref_array.so.1.2.1
/usr/lib/x86_64-linux-gnu/libref_array.so.1.2.1