Array of tuple default initializer assignability issue #15696

let a: [string, 'asc' | 'desc'][];
a = [['some', 'asc']]; // No error

class A {
    a: [string, 'asc' | 'desc'][];
}

class B extends A {
    a = [['some', 'asc']]; // Error string[][] is not assignable to [string, 'asc' | 'desc'][]
}