\operatorname content should not be parsed

[xworld21]

An improbable edge case: characters like -, * get parsed even within \operatorname{}. This should not happen:

$a-b$ $\operatorname{a-b}$

compiles to the PDF Per amsmath documentation, \operatorname{} effectively resets the math codes, disabling the special behaviour of -, *, explaining the above behaviour.

LaTeXML instead prints

<mrow>
  <mi mathvariant="normal">a</mi>
  <mo>−</mo>
  <mi mathvariant="normal">b</mi>
</mrow>

which is not a single operator, and moreover the hyphen has become U+2212.