[FACT-777] Facter should not downcase fact names - Puppet Jira Server

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Acceptance Criteria:
- Mixed-case fact names are allowed
- An error is emitted in Facter if an invalid name is used
Team:
Platform OS
Story Points:
2

I cannot find a document that says that fact names "must" be downcase, but if you create a mixed-case fact, facter will downcase it for you:

Users believe that mixed-case facts can be referenced in Puppet since mixed-case variables are acceptable: https://docs.puppetlabs.com/puppet/latest/reference/lang_reserved.html

If a user creates a mixed-case fact and then uses the mixed-case fact name in their Puppet code, then the fact will have no value.

relates to

PUP-3835 Specify that variables are case sensitive

FACT-3057 Facter ruby API/binding fails to resolve facts from environment variables