Inset property on (shadow) function not rendering on element

[chromalchemy]

tried
(elem :d (s 10 10 :black 10 10 :inset)
(elem :d (s 10 10 :black 10 10 true)
(elem :d (s 10 10 :black 10 10 "inset)

The other properties seem to be working.

Ps. Love how easy it is to apply multiple shadows with :d [(s) (s)] :)