It's a simple non object oriented module.
I would tend to lower-case this variable as stevieb
would, but for me the more important consideration
is use of the fully-qualified format $Data::GUID::Any::UC
(or $Data::GUID::Any::uc) for a variable of this type which
is intentionally not exported from its module; this format
makes it quite clear what's going on IMHO, i.e., use of a
package-global. Lc-first camel-casing is also an option for compound names:
$Data::GUID::Any::upperCase.
Give a man a fish: <%-{-{-{-<
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