Maybe you have missed something when reading the documentation, here is the text around the sample codes from documentation:
The import-package syntax does not have a comparable option to the import-manifest function's check-out-of-date? keyword, and there is no direct way to force synchronization of individual imported packages. However, since packages depend on the identify of their default manifest (see get-default-manifest), changing the manifest containing the location of the package and using that to import the package should result in a newly synchronized version of the package
This explains why changing manifest file could help you reloading your package .
I think there is another informal way to help reloading package files:
add some codes before import-package like:
{do
{with-file-caching-style FileCachingStyle.resynchronize do
{read-from {url "path-to-your-package-file"}}
}
}
I believe this will reload your package file for sure. Add more lines if you need to reload more that one file like the above.
