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path.push() should work as expected on windows verbatim paths On Windows, std::fs::canonicalize() returns an so-called UNC path. UNC paths differ with regular paths because: - This type of path can much longer than a non-UNC path (32k vs 260 characters). - The prefix for a UNC path is ``Component::Prefix(Prefix::DiskVerbatim(..)))`` - No `/` is allowed - No `.` is allowed - No `..` is allowed Rust has poor handling of such paths. If you join a UNC path with a path with any of the above, then this will not work. I've implemented a new method `fn join_fold()` which joins paths and also removes any `.` and `..` from it, and replaces `/` with `\` on Windows. Using this function it is possible to use UNC paths without issue. In addition, this function is useful on Linux too; paths can be appended without having to call `canonicalize()` to remove the `.` and `..`. This PR needs test cases, which can I add. I hope this will a start of a discussion.