Jsonify: readonly messes with Jsonified tuple types

[mfulton26]

Actual

type A = Jsonify<[1, 2, 3]>; // type A = [1, 2, 3]
type B = Jsonify<readonly [1, 2, 3]>; // type B = (1 | 2 | 3)[]

Expected

type A = Jsonify<[1, 2, 3]>; // type A = [1, 2, 3]
type B = Jsonify<readonly [1, 2, 3]>; // type B = readonly [1, 2, 3]

[sindresorhus]

I added a failing test for this: 9c148ac

[Emiyaaaaa]

if an array be Jsonify, i think this jsonify array not a readonly array.
but, result is (1 | 2 | 3)[] but not [1,2,3] is a bug, can i try fix it? @sindresorhus