Question about multiple stack entries

Michael Dawson

This may be a naive question but I see a number of the build packs (for example include both a 

  id = "*"

entry as well as some additional more specific ones.  

Since I think that entry would allow any stack to be used with the build pack, what is the purpose of also having the more specific entries ?

I'm asking to better understand if the extra entries signal that there is something I might need/be able to do in order to support a new stack (even optionally)

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