Describe the bug
Normal Python behavior is to interpret pathlib.PurePosixPath as a string. FileSystemClient.create_directory seems to instead take the name parameter (PurePosixPath.name) and therefore always creates a top-level folder if provided a PurePosixPath. A workaround is to explicitely convert to str beforehand, but I will probably not be the last one to make that mistake, since the framework for ADLS Gen1 treated PurePosixPath as expected.

Example:

To Reproduce

from pathlib import PurePosixPath
mypath = PurePosixPath("toplevel/subfolder/newfolder")
my_file_system_client.create_directory(mypath)

Expected behavior
Create a directory named newfolder in "toplevel/subfolder", just like os.mkdir would.

Actual behavior
Creates a folder newfolder in root.

Additional context
I assume it treats the PurePosixPath as a DirectoryProperties object and takes the "name" argument.