PKGBUILD-vcs.proto - prepare before pkgver?

Hi. prepare()[1] runs before pkgver()[2]. In PKGBUILD-vcs.proto[3], why put prepare() after pkgver()? Got nothing from my poor google-fu[4]. --- [1] https://gitlab.archlinux.org/pacman/pacman/-/blob/a33cdac10bf1a68279ea1b9baa... [2] https://gitlab.archlinux.org/pacman/pacman/-/blob/a33cdac10bf1a68279ea1b9baa... [3] https://gitlab.archlinux.org/pacman/pacman/-/blob/edce7555a6b7410d1a4da6d27d... [4] https://www.google.com/search?q=site:lists.archlinux.org+pkgver+before+prepa... https://www.google.com/search?q=site:lists.archlinux.org+prepare+before+pkgv...