change collections.rb
change collections.rb

`raw_collection.is_a?(String)` covers the same as `raw_collection.instance_of?(String) || raw_collection.instance_of?(ActiveSupport::SafeBuffer)`
Davidzhu001/formtastic,mikz/formtastic,ryanfox1985/formtastic,Guestfolio/formtastic,sideci-sample/sideci-sample-formtastic,ryanfox1985/formtastic,paulodiovani/formtastic,justinfrench/formtastic,justinfrench/formtastic,ConferenceCloud/formtastic,nishaya/formtastic,ConferenceCloud/formtastic,EndingChaung/formtastic,nishaya/formtastic,thenthen8515/formtastic,mikz/formtastic,Davidzhu001/formtastic,thenthen8515/formtastic,paulodiovani/formtastic,EndingChaung/formtastic,Guestfolio/formtastic,justinfrench/formtastic,ryanfox1985/formtastic