DNF vs yum performance question

[Bob Lightfoot]

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Dear Team:
   When running dnf check-update --refresh and comparing to yum
check-update I've noticed that if the same package occurs in multiple
repos {aka. local and remote repos for example} that dnf will list all
packages while yum will list only the package from the repo which
would be used for update.  I'm not sure if this is as desired in dnf
or just plain cornfusing.  Just wanted to point out this is one more
ideosyncrosity of dnf.

Sincerely,
Bob Lightfoot
Long Live Yum - LLY
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