I inside lv() inside fl() is treated literally

Expected #0 to result in @, instead #i results in @:

$fl(0,0,0, "lv(i, @)")$ $#0$ $#i$

Expected @ in each case:

$fl(0,0,0, "lv(a, @)") + #a$
$fl(0,0,0, "lv(tc(cut, b, 0, 1), @)") + #b$
$fl(0,0,0, "lv(tc(cut, c, i, 1), @)") + #c$
$fl(0,0,0, "lv(tc(cut, d, i + 0, 1), @)") + #d$