why not just remove all that logic and default to what npm does ?

@hugomrdias I guess because npm would ping specific version (and not ranges) for 0.0.x versions. If you use ~ instead you would also get other versions and e.g. #357 wouldn't have been needed if bundle-size would automatically use 0.0.3 instead of 0.0.1 of brotli-size.

Npm uses ^ as the default save-prefix which does basically the same as the logic we have now

Nope:

$ echo '{}' > package.json
$ npm install brotli-size
…
$ cat package.json
{
  "dependencies": {
    "brotli-size": "0.0.3"
  }
}

Sneaky bastards 🙃 but that actually doesn't seem that bad, packages in 0.0.x are kinda random with semver