Sane modern languages do all support infinite integers.
ErlangVM is not optimized for math by any mean, but TCO does it in circa 10 secs (half of which is the length calculation, I guess) on my desktop:
defmodule Fib do
def fib(curr \\ 1, acc \\ 0, n)
def fib(_, acc, n) when n <= 0, do: acc
def fib(curr, acc, n), do: fib(acc, curr + acc, n - 1)
1_000_000 |> Fib.fib() |> to_string() |> String.length()
For greater numbers, it definitely would be exponentially dying.
Neither Python nor Java has TCO, so these languages are out of the race here.
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