[NTG-context] 2 issues in phys-dim.mkiv

I've tried the unit interface today, and I've noticed two issues with the following example: \setupunits[alternative=text] \starttext $\unit{-4.6e-3 km s^-1}$ \stoptext 1. Minus superscripts for UNITS (so 's^-1' here—not 'e-3', which is fine) are converted to hyphens with the 'text' unit alternative (with the default 'mathematics' unit alternative everything is fine): 2. The times symbol between the number and the 10^-3 (e-3) is incorrectly spaced (as an ordinary math atom instead of a binary math atom) so doesn't look good. Maybe Hans could change \def\digitstimessymbol{\times} to \def\digitstimessymbol{\ifmmode\times\else${}\times{}$\fi} in phys-dim.mkiv?