CouchDB and npmjs.org. How to make a full replica?

Question

npm

Hello. I am trying to replicate npmjs,org database. As the initial database, I specify the address in CouchDB - isaacs.iriscouch.com/registry . Everything seems to be working, and I have a copy, but for some reason there are not many packages, for example, gulp is completely missing. What am I doing wrong? By the way, I need packages related to gulp.