:title
Test for a list

:sig
function is_list(value : dval) bool

:params
value : value to test

:returns
`true` for a list-shaped value.

:content
`is_list(value)` tests whether a value is a list.

:example capy render
print(is_list(dval(["Ada"])), "\n")

:see-group
dval-access
