Method flattened

paper-api/src/main/java/org/bukkit/Note.java:215–219

@return The note a semitone below this one.

()

     * @return The note a semitone below this one.
     */
    @NotNull
    public Note flattened() {
        Preconditions.checkArgument(note > 0, "This note cannot be flattened because it is the lowest known note!");
        return new Note(note - 1);
    }

    /**
     * Returns the internal id of this note.