Bootstrap 4 navbar height sass variable missing?

I needed a sidebar with 100vh, but I was getting a vertical scrollbar because of the extra height from the navbar. This is what worked for me and the result looks perfect.

calc(100vh - #{$nav-link-height} - #{$nav-link-padding-y * 2})

From this I conclude that the sidebar's height is

$nav-link-height + $nav-link-padding-y * 2

I found the best solution to be to manipulate the padding instead of the height, like so:

$navbar-brand-padding-y: 25px;