Ruby constants autowiring not working

[toshke]

If two components, say A , and B have following defined

A - has an output defined as

# a.cfndsl.rb
Output(:InstanceId) { Value(Ref(:Instance)) } 

B - has an input defined as

# b.cfhighlander.rb
Parameters { ComponentParam :InstanceId,'', type: 'String } 

If C defines both A and B, output-input auto-wiring does not work. However if :InstanceId is replaced with 'InstanceId' this works.