Question juridique clé
Whether the constitutional challenge was timely despite being filed before promulgation after the optional referendum period.
Solution extraite
Premature filing did not bar admissibility; the case could be heard, although such filings usually only justify suspension.
Motifs extraits
For referendable cantonal statutes, the federal deadline runs from promulgation, not from initial publication. An early appeal is not inadmissible as such.