ThisdoublereleaseaddsnewPuppet4features:datainmodules,EPPtemplates,the$factshash,anddatatypes.The5.0.0releaseisfullybackwardscompatibletoexistingPuppet4configurationsandprovidesyouwith[deprecationwarnings](https://github.com/puppetlabs/puppetlabs-stdlib#deprecation) for every argument that will not work as expected with the final 6.0.0 release. See the [stdlib docs](https://github.com/puppetlabs/puppetlabs-stdlib#validate_legacy) for an in-depth discussion of this.
Ifyouwanttolearnmoreaboutthenewfeaturesused,havealookatthe[NTP:APuppet4languageupdate](https://puppet.com/blog/ntp-puppet-4-language-update) blog post.
*[Datainmodules](https://docs.puppet.com/puppet/latest/reference/lookup_quick_module.html#example-with-hiera): Moves all distribution and OS-dependent defaults into YAML files in `data/`, alleviating the need for a `params` class. Note that while this feature is currently still classed as experimental, the final implementation will support the changes here.
*[EPPtemplating](https://docs.puppet.com/puppet/latest/reference/lang_template_epp.html): Uses the Puppet language as a base for templates to create simpler and safer templates. No need for Ruby anymore! You can pass in EPP templates for the `ntp.conf` and `step-tickers` files using the new `config_epp` and `step_tickers_epp` parameters.
*[The$factshash](https://docs.puppet.com/puppet/latest/reference/lang_facts_and_builtin_vars.html#the-factsfactname-hash): Makes facts visibly distinct from other variables for more readable and maintainable code. This helps eliminate confusion if you use a local variable whose name happens to match that of a common fact.
*[Datatypesforvalidation](https://docs.puppet.com/puppet/4.6/reference/lang_data.html): Helps you find and replace deprecated code in existing `validate_*` functions with stricter, more readable data type notation. First upgrade to the 5.0.0 release of this module, and address all deprecation warnings before upgrading to the final 6.0.0 release. Please see the [stdlib docs](https://github.com/puppetlabs/puppetlabs-stdlib#validate_legacy) for an in-depth discussion of this process.