Note initial addition of p5-Hash-Merge version 0.10 as devel/p5-Hash-Merge
into The NetBSD Packages Collection.

The Perl 5 module Hash::Merge merges two arbitrarily deep hashes
into a single hash. That is, at any level, it will add non-conflicting
key-value pairs from one hash to the other, and follows a set of
specific rules when there are key value conflicts.

(seb)