get_or_set() is not compatible with get()

[WinnieP]

If you get_or_set() with a timeout, the value is still retrievable with get() even after it expires. The expectation seems to be that a key set in this way is always retrieved with get_or_set(), and it's fresh_key that expires, not the underlying key.

Also, without stale_cache_timeout, the actual key will have no expiration which is not what I'd expect from default behavior.

cache.get_or_set('foo', lambda: 'bar', 10)
# wait over 10 seconds
cache.get('foo') # returns 'bar'