Github user steveloughran commented on the issue:
https://github.com/apache/flink/pull/4397
We've long experimented with the best way to do this in Hadoop, and I think
we're converting on moving off any form of enum to some `hasFeature(String)`
predicate. Why? Lets you handle a more of the obscure corner cases of
blobstores, and have room to play in future versions. If it's a simple bool
`isPosix()` all seems well, but in future you may even there want to consider a
test for whether seek + write is supported, the FS is case sensititive, etc.
Strings are probably going to turn out to be the best option
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