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import {binary} from 'rambda'
describe('R.binary', () => {  it('happy', () => {    const result = binary(function(x: number, y: number, z) {      expect(arguments.length).toBe(2)      expect(z).toBeUndefined()      expect(x).toBe(10)      expect(y).toBe(20)      return x + y    })(10, 20, 30)    result // $ExpectType number  })})