MapOf issue with undefined value

[jdeniau]

Memo for myself :

const i: MapOf<{ foo?: string }> = Map({
      foo: 'foo',
    });

triggers an error

Type 'MapOf<{ foo: string; }>' is not assignable to type 'MapOf<{ foo?: string | undefined; }>'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.ts(2322)

In fact as string object is more specific than string | undefined, it should be valid.

It seems that the comparison is "swapped"

[jdeniau]

Fixed by #1932 and #1958