In “You Learn,” the song that concludes the new musical “Jagged Little Pill” on a note of hard-won, almost downbeat uplift, a lyric from Alanis Morissette recommends the advantages of “biting off more than you can chew.” It’s advice that the creators of this ambitious but frustratingly diffuse show, inspired by Morissette’s angsty album of the same title, and with a book by Oscar winner Diablo Cody, seem to have taken a little too seriously.  Although this portrait of a family weathering multiple crises often has a vital, beating heart, at other times the zigzagging storylines — which cover ripped-from-the-headlines…

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