Hi! This may be a newb question, but is there a way to resolve an Ouput (specifically, a StackReference.get_ouput result) to it's value at runtime? I'm writing a simple security group helper that needs to know if the input is a security_group or a cidr_block. I'd like to simply test if the first letter of the string is a digit or 's' (as-in 'sg-XXXXXX').