Name reported as available but can't be used in npm publish

[astur]

I had try to publish on npm package named 'while-true'. npm answered me:

npm ERR! publish Failed PUT 403
npm ERR! code E403
npm ERR! Package name too similar to existing packages; try renaming your package to '@astur/while-true' and publishing with 'npm publish --access=public' instead : while-true

And it was first moment when I found that something wrong with name 'while-true'. This name is reported by npm-name as available:

~ $ npm-name while-true
✔ while-true is available

It will be better if npm-name will say something like this:

⚠ while-true is free but available

...or like this:

⚠ while-true is too similar to existing package whiletrue

[sindresorhus]

Duplicate of #7