New submission from Barney Gale <barney.g...@gmail.com>:

`pathlib.Path.is_mount()` calls `Path(self.parent)`, which:

- Is needless, as `self.parent` is already a Path instance!
- Prevents effective subclassing, as `self.parent` may be a `Path` subclass 
with its own `stat()` implementation

----------
components: Library (Lib)
messages: 363633
nosy: barneygale
priority: normal
severity: normal
status: open
title: `pathlib.Path.is_mount()` calls `Path(self.parent)` and therefore 
misbehaves in `Path` subclasses
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39897>
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