this is necessary because if you have a data URI rather than a url, you could have multiple copies of a huge file (several hundred kb is not uncommon) in memory, which is not ideal.  By hashing the url, you get something much smaller to hash, this allows the data URI to be garbage collected, but a normal url will be saved at https://github.com/mghayes/sentry/blob/165d481c2aa79902c53b5b8ab74e343d99df500a/src/sentry/tasks/fetch_source.py#L283