Problem:
`vim.tbl_get(tbl, nil, 1)` returns `tbl` itself. In this case, `keys` is not
empty, but `ipairs` skips the iteration:
local keys = { nil, 1 }
assert(#keys == 2)
for i, k in ipairs(keys) do
assert(false, 'unreachable')
end
Solution:
Use `select("#", ...)` and `select(i, ...)` to ensure consistency for count and
iteration.
cd3855fb2b
