On Wed, 6 Jan 2021 17:51:20 GMT, Uwe Schindler <uschind...@openjdk.org> wrote:

> Another option would have been to just check the class with instanceof. If 
> the FileChannel returned by the path's filesystem has wrong type, it won't 
> work. If we have some custom filesystem that just returns the original 
> FileChannelImpl but does some additional checks before or after (e.g to hide 
> some files from user), this would still work.

We considered this - but we opted for better clarity and alignment with 
existing APIs.

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PR: https://git.openjdk.java.net/jdk16/pull/90

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