Description:

'require EXPR' only accepts 'Class/Name.pm' style module names, not
'Class::Name'. How frustrating! For that, we provide 'load_class
'Class::Name''.

It's often useful to test whether a module can be loaded, instead of
throwing an error when it's not available. For that, we provide
'try_load_class 'Class::Name''.

Finally, sometimes we need to know whether a particular class has been
loaded. Asking '%INC' is an option, but that will miss inner packages and
any class for which the filename does not correspond to the package name.
For that, we provide 'is_class_loaded 'Class::Name''.