AbstractFileName ctor accepts FileName as a parameter, but actually requires 
AbstractFileName
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                 Key: VFS-337
                 URL: https://issues.apache.org/jira/browse/VFS-337
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 1.0
            Reporter: Sebb


The AbstractFileName constructor accepts FileName as a parameter, but actually 
requires an AbstractFileName.
Anything else will generate a ClassCastException.

The reason for the cast is to allow access to the package-protected method void 
AbstractFileName#setType(FileType type)

Many of the AbstractFileName methods rely on being able to invoke the setType 
method, so perhaps the parameter should be changed accordingly?
This will change the API and require changes to subclasses.

I'll add Javadoc to document the restriction.

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