don't use named list as data1

[EmilHvitfeldt]

If this also translates to the altrep objects we can get a nice improvements.

we don't use the names internally anyways as we are extracting by index

lobstr::obj_size(list(1, 2, 3))
#> 248 B
lobstr::obj_size(list(h = 1, d = 2, e = 3))
#> 608 B

^{Created on 2024-05-24 with reprex v2.1.0}