>Having to reveal your salary history you may as well not even negotiate.

Having to? It's not a requirement. I used to get asked this all the time. They want to know how much I made last gig? I tell them the rate I want, not the rate I got.

That's right, if they ask me a question they have no business asking and can never confirm, I reserve the right to tell them what I want them to believe.

I also think it's sexist to frame this as equal pay for women. That implies that women are predisposed to be bad negotiators.