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Python: jinja2 incompatibility with paths created using pathlib

Problem

When using a clone of the git repository on an Ubuntu Focal Fossa, I get the following error:

root@eole3:~/laboite# ./tools/eole3 --config socle.ini build socle
Traceback (most recent call last):
  File "./tools/eole3", line 15, in <module>
    sys.exit(cli())
  File "/usr/lib/python3/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 1134, in invoke
    Command.invoke(self, ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/root/laboite/tools/src/eole3/options.py", line 19, in wrapper
    return func(*args, **kwargs)
  File "/root/laboite/tools/src/eole3/options.py", line 34, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/root/laboite/tools/src/eole3/commands/build.py", line 31, in build
    default_loader = FileSystemLoader(data.templates_dir)
  File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 163, in __init__
    self.searchpath = list(searchpath)
TypeError: 'PosixPath' object is not iterable

Proposal