Letters incorrectly read as Roman numerals

[MartheGjelstad]

I have noticed multiple cases where letters are incorrecly read as Roman numerals. Below are some examples and the output from MathCAT.

<math> <mi>C</mi><mo>=</mo><mi>D</mi> </math>

Output: "100 is equal to 500"

<math> <mi>C</mi><mo>+</mo><mi>I</mi><mo>+</mo><mi>X</mi> </math>

Output: "100 plus 1 plus 10"

<math> <mi>I</mi> <mo>=</mo> <mo>−</mo> <mi>b</mi> <mi>r</mi> <mo>+</mo> <msup> <mi>z</mi> <mi>I</mi> </msup> </math>

Output: "cap i is equal to, negative b r, plus z to the first power"

[moritz-gross]

thanks for the good examples.
I added regression tests for them in the PR 🫡