I’m not aware of any issues. Do you have many auto coupons by any chance?
Or if you don’t use the auto coupon feature at all, does disabling WJECF_AutoCoupon fix the memory issue?
Alternatively, what if you append the following line before line 43: if ( $object instanceof WC_Coupon ) ?
$this->wrappers = array();
Does that solve the memory issue?
…I have been thinking about dropping WC2 support but haven’t made up my mind yet.