Juan

Hi, pylatexenc 2.10 is failing with the construct: `LatexNodes2Text().latex_to_text(unicode_to_latex(LatexNodes2Text().latex_to_text(r"$\pm$")))` giving empty strings. The conversion: `LatexNodes2Text().latex_to_text(r"$\pm$")` gives the expected result: `'±'` and the conversion to latex: `unicode_to_latex('±')` seems to be ok...