`radian.alt_key_map` option does not work? wrong term?

[rkrug]

I would like to use the option key on the Mac (alt key) to insert -> when typing -, so I changed the example to use radian.alt_key_map instead of radian.escape_key_map, but it does not work as shown below.

I assume, radian.alt_key_map is the wrong name - but what is the right term?

options(
    radian.alt_key_map = list(
        list(key = "-", value = " <- ")
    )
)

the escape one works.