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(* Operations on internal representations of values *)
type t
external repr : 'a -> t = "%identity"
external magic : 'a -> 'b = "%identity"
external is_block : t -> bool = "obj_is_block"
external tag : t -> int = "obj_tag"
external size : t -> int = "%obj_size"
external field : t -> int -> t = "%obj_field"
external set_field : t -> int -> t -> unit = "%obj_set_field"
external new_block : int -> int -> t = "obj_block"
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