feature: new builtinhelp wanted
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Description
It is currently not possible to query or modify the permissions of a file or directory from Unison. Support for these functions would need a native implementation.
My use-case: In dhall-unison I'd like to check if the cache directories are readable and writeable. As a "workaround" I always attempt to read/write files and handle errors appropriately
See also this discussion on Slack https://unisonlanguage.slack.com/archives/CLUNF0J5S/p1641645307009800