Path.isReservedDeviceName

Detect whether this path's final component is a reserved Windows device name.

Platform semantics:

• Windows: Returns true for names like CON, PRN, AUX, NUL, COM1..COM9, LPT1..LPT9, even when followed by an extension (e.g., CON.txt). Also returns true for device namespace forms like \\.\\NUL and \\?\\NUL.
• Other platforms: Always returns false.

Notes:

• This check is purely syntactic; it does not consult the filesystem.
• Trailing dots and spaces are ignored as Windows normalizes them away.