Make the Tag render function public

[robertschmid-ast]

I have a case where I need access to render(render: Tag, level: Int = 0) -> String

[tib]

Can I ask you why do you need access to this function? What's your use case?

[robertschmid-ast]

I'm using HTML to assist in visualizing some large datasets. However, it turns out the datasets are so large rendering every row using the Tags is a bottleneck. So I use the tags to render a couple of header rows, add the rest of the rows as strings then add that String to the table using setContents.