Fix #340 by pruning form fields with changed value types
Fix #340 by pruning form fields with changed value types

Thanks @garyb for the tip.

shujuwen2013/slamdata,mossprescott/slamdata,drostron/slamdata,drostron/slamdata,natefaubion/slamdata,cryogenian/slamdata,beckyconning/slamdata,zeeiyerWork/slamdata,wemrysi/slamdata,zeeiyerWork/slamdata,shujuwen2013/slamdata,jonsterling/slamdata,natefaubion/slamdata,beckyconning/slamdata,natefaubion/slamdata,sellout/slamdata,wemrysi/slamdata,cryogenian/slamdata,sellout/slamdata,mossprescott/slamdata,jonsterling/slamdata