In some regions, joint publishing is standard practice where a book packager/company collaborates with a licensed state publisher. Because Hardcover’s Publisher metadata field currently only accepts a single value, users and data imports create fragmented, duplicate publisher entries using various delimiters (e.g., Nhã Nam & NXB Văn Học, NXB Văn Học, Nhã Nam, Nhã Nam | NXB Văn Học).

This creates duplicate entities, cluttered search results, and inconsistent metadata across the platform.

Proposed Solution
Update the edition metadata schema to support multiple publishers, similar to how the Author/Contributor field works.