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if I try to publish a new package css3 with 'npm publish' when there is a package css, I get server response 500.
If I try to npm install css3, it installs css.
What I could see from the documentation, a trailing number is allowed?
Test for #2658
That's definitely weird, and I can't reproduce it. What version of npm are you using? Can you share the npm-debug.log file?