the original_artifact JSON properties in revision.metadata for all imported tar/zip files look this:
"original_artifact" : [ { "name" : "birdfont_0.37-3.dsc", "sha1" : "89d3ba1591147f215f9ad0603184c2c43b6bb693", "length" : 99, "sha256" : "ff67d9d596c1db8ccf5ffa702e9226f549177e48bd74c6a0c0123d951584f26c", "sha1_git" : "4adf3851d7fc5a6d3273943209e68a12bad34de6" }, { "name" : "birdfont_0.37.orig.tar.gz", "sha1" : "f8662ae8c52e4604264aff605b8c5395b757724c", "length" : 99, "sha256" : "6c2d40ffdc7b78d6391d911aa222ff70b72c1776d297940a1bb949c6fc02cdd0", "sha1_git" : "b7f56d2480b652727da3021df08dd31cc377f679" }, { "name" : "birdfont_0.37-3.debian.tar.xz", "sha1" : "431a696a39e7ce44b8aa5c55daeb2e833dd2a7d5", "length" : 99, "sha256" : "448e1c943b8e9f6d12b39fc6a7dcf9b6668b74b3754520e4098365e7efc5ae94", "sha1_git" : "bf948334fe2126c8fbd43c6102881332e6a6335f" } ]
Differently from what happens for the tarball loader, we don't have an archive_type field here. We should add it, both to the git loader and to the already imported data.
Note that it is not 100% clear where to add it. In the case of the tarball loader we have it in each element of the array, but that's easy because it's an array with a single element. What do we want to do here? Add it to all elements, or rather structure a bit more "original_artifact" to have an "archive_type" property and then a "members" array? That would impact T339 too.