Version v1.12.0 was the final feature release of the MongoDB BSON library and version v1.12.2 is the final patch release.
As of August 13, 2020, the MongoDB Perl driver and related libraries have reached end of life and are no longer supported by MongoDB. See the August 2019 deprecation notice for rationale.
If members of the community wish to continue development, they are welcome to fork the code under the terms of the Apache 2 license and release it under a new namespace. Specifications and test files for MongoDB drivers and libraries are published in an open repository: mongodb/specifications.