exact empty object not working

[villesau]

following code fails:

/* @flow */

type Empty = {||};
const huh = (ob: Empty) => ob;
huh({});

to this:

5: huh({});
       ^ object literal. Inexact type is incompatible with exact type
4: const huh = (ob: Empty) => ob;
                    ^ exact type: object type

see: https://flow.org/try/#0PQKgBAAgZgNg9gdzCYAoVAXAngBwKZgCiAtjtmALxgDeAPrQL4DcqAxnAHYDOGYAFgFc+lMAAo4AIwBcRUtgCUlAHxhJLQX1HUG8pkA

when following works just fine:

/* @flow */

type NotEmpty = {|lol: number|};
const huh = (ob: NotEmpty) => ob;
huh({lol: 1});

see: https://flow.org/try/#0PQKgBAAgZgNg9gdzCYAoVAXAngBwKZgBycGAogLY7ZgC8YA3gD7wwBcYAdgK7kBGeAJ0YBfANyoAxnA4BnDGAAWXBbTAAKOL3bEylbAEpaAPjCbxShWvot2ARmH7RQA

[jcready]

Duplicate of #4582