export declare function equals<B>(that: B): <A>(self: A) => boolean
export declare function equals<A, B>(self: A, that: B): boolean

export declare const isEqual: (u: unknown) => u is Equal

export declare const equivalence: <A>() => Equivalence<A>

export interface Equal extends Hash.Hash {
  [symbol](that: Equal): boolean
}

export declare const symbol: typeof symbol