Puppet users - May 2014 - hiera hash to create_resources bombing - looking for how to troubleshoot

I found this reported bug:
https://tickets.puppetlabs.com/browse/PUP-1100

Any clue how to debug it ?
This hit me when moving from Puppet 3.5.1 on RHEL 5 to Puppet 3.6.0 on RHEL 6
The defined type that it is barfing on is moderately complicated.

“Sometimes I think the surest sign that intelligent life exists elsewhere in the
universe is that none of it has tried to contact us.”  (Bill Waterson: Calvin
& Hobbes)

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