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De Wiktionario

§2

The NORM OF PRONUNCIATION is "continental." The sound values of the various letters are fluid within type limits. They may be naturally influenced by neighboring sounds as also by native habits of individual speakers. For instance, the sound of u - described in the phrase, "like u in 'plural' " -- may well be pronounced like oo in 'good' or in 'loom' but not like u in 'stutter' or in French 'lune.'