[BUG] npm pack fails on scoped packages

[isaacs]

found while debugging #1597.

$ npm pack
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path @isaacs/bundle-metadep-duplication-x-1.0.0.tgz
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, open '@isaacs/bundle-metadep-duplication-x-1.0.0.tgz'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/isaacs/.npm/_logs/2020-08-01T23_21_12_399Z-debug.log

It should remove the scope when creating the tarball filename.

[ljharb]

Remove it? Won’t that potentially create conflicts? (if not, why is the package name in the filename at all?)