“(On outing her sister to their parents) ‘What I didn’t say in the book is how it messed up our relationship for like two years,’ Dunham said, sipping a smoothie as industrial-grade Vitamix blenders roared in the background.

‘It was not two days,’ Dunham said. ‘It was a month.’

‘It was about a week,’ Grace said. ‘It was about two weeks to one week.’

‘You came out to me, like, a week into shooting ‘Tiny Furniture,’ ’ — Dunham’s 2010 feature film — ‘and I didn’t tell Mom and Dad for like a week after we wrapped.’

Grace rolled her eyes. ‘Without getting into specifics,’ she said, ‘most of our fights have revolved around my feeling like Lena took her approach to her own personal life and made my personal life her property.

Basically, it’s like I can’t keep any of my own secrets,’ Dunham said. ‘And I consider Grace to be an extension of me, and therefore I couldn’t handle the fact that she’s a very private person with her own value system and her own aesthetic and that we do different things.”