dotnet
"Significant characters" in Path.GetFullPath
Path.GetFullPath is documented in part as follows:
If a path contains no significant characters, it is invalid unless it contains one or more "." characters followed by any number of spaces; then it will be parsed as either "." or "..".
As far as I can see, the term "significant character" is not defined anywhere, either in the docs or apparently on any of the Internet (from thirty seconds of Googling); I believe one must read the code before finding any more references to this term.
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More generally, the docs require a bunch of Windows knowledge to read; e.g. I believe "If you pass in a short file name, it is expanded to a long file name." is meaningless except on Windows? Some other docs are explicit about which parts of their text refer to which platforms, and I think that would help a lot here, because it seems to me that many of the Remarks for GetFullPath are Windows-specific.