Hi

a year or so before one could simply typeset the physical half-life as
shown in MWE:

\usetypescript[palatino]
\setupbodyfont[palatino]
\starttext
    ½ α
    \m{T_α}
    \m{T_½}
\stoptext

The greek letter is just to show, that utf-8 works as expected. In actual
beta (and probably longer before) this doesn't work anymore. What have I
missed?

Thanks
Christian