Oops; when to Thomas instead of list; sorry. (Gmail, ugh!)
"went", not 'when". (Kent's typing skills, ugh!)
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It depends on where you plan to submit your changes.
If you want to help developing the upstream software project, then work
on a git clone and ask the upstream project people for advise how to
contribute.
If I'm understanding correctly, yea!
Also, I'm leaning toward the understanding that if I want to make an improvement, bug-fix, etc, to the program itself, I probably want to go to the upstream maintainer (through the proper channels); if I want to make an improvement, bug-fix, etc that is specific to Debian's implementation of the program, I probably want to go to the Debian maintainer (through the proper channels).