find _build/ -name "*.cmi"
_build/default/src/.read_heights.objs/byte/read_heights.cmi
_build/default/src/.read_heights.inline-tests/.read_heights.inline-tests.eobjs/byte/run.cmi
cmitomli _build/default/src/.read_heights.objs/byte/read_heights.cmi
type hgt = { data : Core.Bytes.t; xlen : int; lat : float; lon : float; }
val get_hgt : string -> string -> hgt
val get_alt : hgt -> float -> float -> float
val stream_fold : ('a -> 'b -> 'b) -> 'a Stream.t -> 'b -> 'b
val line_stream : Core.In_channel.t -> Base.string Stream.t
type hgt_record = { p : string; z : string; }
val get_map_files : string -> (string, hgt_record) Core.Hashtbl.t