just_executable() and other functions return the native path, not the cygpath, when in Windows

1) I am confused by the following sentence in the just doc:

On Windows, invocation_directory() uses cygpath to convert the invocation directory to a Cygwin-compatible /-separated path. Use invocation_directory_native() to return the verbatim invocation directory on all platforms.

Running the following on Windows, I still get Windows-native paths e.g. D:\some\thing\

@test:
echo '{{just_executable()}}'
echo '{{justfile()}}'
echo '{{justfile_directory()}}'
echo '{{source_directory()}}'
echo '{{invocation_directory()}}'

2) Not clear: does `just` require `cygpath.exe` in the system $PATH while on Windows? does it fail if it does not find it?

3) The sentence above also conflicts with https://just.systems/man/en/paths-on-windows.html

4) There should be a function to normalize Windows path to Unix / POSIX paths and vice-versa.