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The Path class is currently mutable to support the IOReadableWritable serialization, but many parts of the code assume that the Path is immutable. The mutable Path class is prone to subtle errors. By making the URI in the Path class immutable, we   the path can be properly store configured paths stored without the risk of them being mutated as side effects. 

Public Interfaces

Modify the Path class to no longer implement the IOReadableWritable interface.

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