object type does not work with in operator

[EliSnow]

TypeScript Version: 2.2.1

Code

const b = "foo" in <object> {};

Expected behavior:
The in operator works

Actual behavior:
A compile error is provided:
The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter

[axefrog]

Just experienced the same issue:

export function isIterable<T>(value: object): value is Iterable<T> {
  return Symbol.iterator in value;
}