[Puppet Users] deep_merge and hiera

I was playing around with the new deep-merge hiera feature to check it's
usability

I found some unexpected behaviour with array resolution

the following yaml files get parsed

top.yaml:
   ----
   arr:
     - 1
   hsh:
     arr:
       - 1

mid.yaml:
   ----
   arr:
     - 2
   hsh:
     arr:
       - 2

bot.yaml:
   ----
   arr:
     - 3
   hsh:
     arr:
       - 3

with :merge_behavior: deep (or deeper) I get the following result

$ hiera -a arr
[1, 2, 3] # I expected this

$ hiera -h hsh
{"arr"=>[3, 2, 1]} # I expected {"arr"=>[1, 2, 3]}

I've located the curl-pit in the deep_merge gem, but I am not sure if this
must be fixed there (the deep_merge gem is probably used by others)

any thoughts?

Fred.