Ltac bitwise := bitwise as ?m ?Hm.
Global Hint Rewrite lxor_spec lor_spec land_spec ldiff_spec bits_0 : bitwise.
(** The streams of bits that correspond to a numbers are exactly the ones which are stationary after some point. *)

Lemma are_bits : forall (f:t->bool), Proper (eq==>Logic.eq) f ->
((exists n, forall m, 0<=m -> f m = n.[m]) <->
(exists k, forall m, k<=m -> f m = f k)).