Is a graft warranted here?

[Felix Lechner via]

Hi,

Why does the package definition below provide a grafted version 1.08.1
instead of the source I requested, please?

Kind regards
Felix

* * *

(define-public nyacc/juix
  (let* ((commit "41691b062b598a92549821879766e0ee48b635da")
         (revision "0"))
    (package
      (inherit nyacc)
      (name "nyacc")
      (version "1.10-dev")
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://git.savannah.nongnu.org/git/nyacc.git";)
                      (commit commit)))
                (file-name (git-file-name name version))
                (sha256
                 (base32
                  "1fa88fix6avyazyiy4k70v9fzdkz1i0p99xnmxmq94j3wpc76y3j"))
                (modules '((guix build utils)))
                (snippet
                 '(substitute* "configure"
                    (("GUILE_GLOBAL_SITE=\\$prefix.*")
                     "GUILE_GLOBAL_SITE=\
$prefix/share/guile/site/$GUILE_EFFECTIVE_VERSION\n"))))))))