>> 1) You have to remember to modify it back at some point, and if you are 
>> iterating frequently this is tedious and error-prone
>> 
>> One way I can think of to avoid Package.swift is to place DevPackages inside 
>> some special folder (perhaps: DevPackages/) inside the root package which 
>> sounds good if I am developing some patch to some package but it might be 
>> awkward if I am starting to write a library and want to create a package to 
>> try it because I'll already have created the library package (though maybe 
>> minimal) but then I'll have to move the library inside DevPackages/
> 
> Well, it seems to me part of the utility here is having a package be a local 
> clone in an entirely different directory. So this sounds a bit tedious.
> 
> 
> Any other way you can think of to avoid Package.swift?
>  

This seems pretty similar to standard overrides as part of the lockfile 
proposal to me, so we could add it on there, maybe with
a convenience command line.

>> This would be a bit awkward but sounds good enough to me
>>  
>> 2) We don’t want any chance that DevPackage gets into the package graph and 
>> thus the ecosystem.
>> 
>> what if one of the dependencies depend on a package inside DevPackage then 
>> should the DevPackage be preferred?
> 
> Don’t understand.
> 
> RootPackage 
> Dependency: APackage
> DevPackage: BPackage
> 
> APackage
> Dependency: BPackage
> 
> If DevPackages don't specify version in Package.swift, in case of a collision 
> should the DevPackage be always preferred?

Root package always has override precedence.
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