[NTG-context] Using \cal, \frak, \goth in math mode

In ConTeXt, \cal, \frak and \goth (etc) are considered "text only" commands. To use them in math mode one has to use \gothing, \fraktur, \calligraphic etc, which make a temporary switch to text mode. This is contrary to the LaTeX expectations, where $\cal ABC$ makes all three letters calligraphic. How could such a thing be achieved in ConTeXt? -- Giuseppe "Oblomov" Bilotta