in src/PublicToInternalGenerator/PublicToInternalGenerator.cs [192:200]
public override SyntaxNode? VisitDelegateDeclaration(DelegateDeclarationSyntax node)
{
var visited = (DelegateDeclarationSyntax?)base.VisitDelegateDeclaration(node);
if (visited is null) return null;
visited = WithExtraAttributes(visited);
visited = ChangePublicToInternal(visited);
return visited;
}