in src/PublicToInternalGenerator/PublicToInternalGenerator.cs [162:170]
public override SyntaxNode? VisitInterfaceDeclaration(InterfaceDeclarationSyntax node)
{
var visited = (InterfaceDeclarationSyntax?)base.VisitInterfaceDeclaration(node);
if (visited is null) return null;
visited = WithExtraAttributes(visited);
visited = ChangePublicToInternal(visited);
return visited;
}