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Description
The documentation doesn't provide clear guidance on how you stipulate a root path in a cross platform manner.
Whist \tmp isn't an absolute path on windows it does describe a path that is relative to the root directory of the current drive and below I will refer to this as an root relative path.
Reading the documentation its not clear how to stipulate a root relative path.
For instance are each of the following the same:
join('/tmp');
join('/', 'tmp');
join('\tmp');
join('', 'tmp');
It would be useful if the documentation was explicit on this point.