If you are like me and you like to try things out, you might be tempted to test your packages with 1.6. If you then commit your environment files, you might not be able to go back to 1.5 without some work. Some of the packages that end up in your environment will not run with Pkg used with 1.5.
I believe it’s just the
Manifest.tomls created by 1.6 that are not backwards compatible. The packages themselves (by default) should be installed separately.
Yes, that is what I meant. The installation of the said packages would be broken.