4.0.0-beta.2 => 4.0.0-beta.3 - outline buttons active state incorrect

Created by: niftylettuce

I can't seem to find any documentation as to why the active state color was changed for buttons such as .btn-outline-secondary. The contrast on active state is horrible and this seems recently changed between beta version 2 and 3.

https://getbootstrap.com/docs/4.0/components/buttons/#outline-buttons (press in / trigger active state on the buttons)

the desired result should be what was in beta version 2 where the text color is white on active state/press.

the only change seems to be https://github.com/twbs/bootstrap/blob/v4.0.0-beta.2/scss/mixins/_buttons.scss#L80 and https://github.com/twbs/bootstrap/blob/v4.0.0-beta.3/scss/mixins/_buttons.scss#L82

I think there's a typo, shouldn't color: color-yiq($color-hover) actually be color: color-yiq($active-background)?