Issue #20923 has been updated by Charlie Sharpsteen.

Status changed from Unreviewed to In Topic Branch Pending Review
Branch set to https://github.com/puppetlabs/puppet/pull/1670

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Bug #20923: Hiera cannot take `undef` as a default value
https://projects.puppetlabs.com/issues/20923#change-91639

* Author: Raphaƫl Pinson
* Status: In Topic Branch Pending Review
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* Affected Puppet version: 
* Keywords: 
* Branch: https://github.com/puppetlabs/puppet/pull/1670
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As discussed with Jeff McCune yesterday, I believe #13210 is not a duplicate of 
#15329, as #13210 can be fixed without fixing #15329 per se.

Here's the idea:

* Implement a new `:honor_undef` option for functions, defaulting to `false`;
* Implement a new `:hiera_munge_undef` option in puppet.conf, defaulting to 
`true` for backwards compatibility;
* Use `:honor_undef = true` in all hiera functions when `:hiera_munge_undef` is 
set to `false`.

The code can be found in this PR: https://github.com/puppetlabs/puppet/pull/1670


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