fSpec question

I've gathered from the documentation that an fspec (fetch specification)
can look like -

1.) A simple string like "xyz = 'value'"

2.) An array with subkeys like -
['qualifier']['xyz'] = 'value'
['qualifier']['abc'] = 'value'
['sortOrdering'] = ['value', 'value', ...]
['attributes'] = ['value', 'value', ... ]

but the documentation of person.fetchEnterprises mentions a ['hint']
subkey, specifically a ['hint']['attributes'] that according to the
documentation seems the same as just ['attributes'].

So I'm curious if there is a difference between something under ['hint']
verses otherwise, and if handling of fSpec is the same for all methods
that use it or if each nuances it in some way.

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