Where did MathString go?

[bmitc]

I haven't used Polyglot Notebooks in about a year. I opened up an old notebook of mine that contained MathString, something I used to use a lot, but now it generates an error.

How do I display a string containing LaTeX markup in a notebook now? Here is my notebook version information.

[jonsequitur]

You can use Microsoft.DotNet.Interactive.Formatting.LaTeXString. The two types were redundant and MathString was removed.