package core

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package core
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keys that map to an accumulator value with an associated fold operation

module Key : sig ... end
val set : t -> key:('a, 'b) Key.t -> data:'b -> t

reset the accumulator

val find : t -> ('a, 'b) Key.t -> 'b

the current accumulator

val add : t -> key:('a, 'b) Key.t -> data:'a -> t

fold value into accumulator

val change : t -> ('a, 'b) Key.t -> f:('b -> 'b) -> t

accumulator update