Patched serialized_attributes for 1.8.7
Patched serialized_attributes for 1.8.7

I really need to discontinue support for 1.8.7...

randym/axlsx,kappiah/axlsx,Debiancc/axlsx,romuloceccon/axlsx,pedrogarrett/axlsx,legitscript/axlsx,VueOps/axlsx,woto/axlsx,bradstewart/axlsx,sr-education/axlsx,sh-ft/axlsx,mromulus/axlsx,raghavendra-prithvi/axlsx,clarkcutler/axlsx,alexanderfrankel/axlsx,nilbus/axlsx