I have a fairly large document, 50-60 pp, with lots of numerals, including hundreds of dates. I wanted to see how it would look with old-style numbers and I assumed I could bracket the whole text section of the document within braces and apply the \os command. I didn't turn out as I expected, however. It did convert the numbers to old-style digits. But it also unexpectedly changed the em and en dashes back to hyphens, as they were entered in the source .tex document. MWE follows below. I could possibly do a search-and-replace but I am hoping there is a simpler way to do it.. I am using Libertinus Serif (which does support old style numerals) and columns, if that matters. Thank you. \starttext First two examples: Brackets surround text including digits, grouped hyphens are {\emph not} converted to en and em dashes. {\os Ford--Chevy 12345 Chrysler---Plymouth 67890 } \blank[line] Next two examples: Brackets surround just the digits, the grouped hypehns {\emph are} correctly converted to en and em dashes Honda--Toyota {\os 12345} Renault---Volkswagen {\os 67890} \stoptext