After upgrade from Puppet `5.5.6` to `5.5.7` I'm hitting a strange error:
Could not evaluate: undefined method `split' for ["www-data"]:Array
that might be connected to Custom Type provider, though I can't find any usage of `split` function in my codebase. Any idea what could cause such error? The changelog [doesn't suggest major changes](https://puppet.com/docs/puppet/5.5/release_notes.html#puppet-557).
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