Netflix classifies its new series Firefly Lane — in which Katherine Heigl and Sarah Chalke play lifelong friends — as a "premium soap." Neither term is quite right. "Premium" is not usually a word associated with cheesy dissolve cuts and distractingly bad wigs. And "soap" — well, any true soap opera is confident enough in its soapiness that it doesn't need to hide behind labels like "premium." Instead, think of Firefly Lane (premiering Wednesday) as an overlong PG-13 Hallmark movie boosted (a bit) by a pair of premium actresses. Based on Kristin Hannah's 2008 novel, Firefly Lane follows Tallulah "Tully" Hart (Heigl) and Kate Mularkey (Chalke) over 30 years of friendship and falling outs. We first meet the girls as polar-opposite teens in the Seattle suburbs, when the cool and beautiful Tully (Ali Skovbye) moves on to the titular street right next to bookish and awkward Kate (Roan Curtis). Both are lost in their own ways. Tully's mom (Beau Garrett) is a spaced-out alcoholic hippie who calls herself "Cloud." Kate feels like a nobody at home and at school. Soon, the girls are inseparable.