> Some obscure corner-cases changing behavior is kinda expected in this kind of 
> cleanup. Is there some real-world usage which breaks because of this, 
> something that can't be trivially fixed?

Through test cases, I found that the 
https://github.com/rpm-software-management/rpm/commit/aec8bdb53a3013eabf16368e17a65ab69c2136ee
 changed the function. As a result, the behavior of some commands is changed. 
Currently, there is no actual service problem. I haven't had any problems with 
the business until now.

In addition, through code analysis, I find that the character string of 
undefine is determined whether the character string belongs to "a-z" or "A-Z" 
or "0-9" or '_'

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