$parse method not throws an exception for invalid exponent value

[ghost]

it('will not parse invalid scientific notation', function () {
    expect(function () {
        parse('42e');
    }).toThrow();
});

The test above fails wherares the angular $parser works properly with this and throws an exception. The сulprit is Lexer.prototype.isNumber method which returns true for booleans passed as an argument (in this case 'false').