## Changes
This came up in #2122 where relative library paths showed up with
backslashes on Windows. It's hard to run acceptance tests where paths
may be in either form. This change updates path translation logic to
always use forward slash-separated paths, including for absolute paths.
## Tests
* Unit tests pass.
* Confirmed that code where library paths are used uses the `filepath`
package for path manipulation. The functions in this package always
normalize their inputs to be platform-native paths.
* Confirmed that code that uses absolute paths works with forward
slash-separated paths on Windows.
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