Allow for 'special' partitions that are omitted in the staleness check. #68
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It is sometimes useful to have additional information in the file path that we can access programatically but are not 'normal' partitions. For instance, it can be helpful to encode versioning or hash metadata into the path. However, this can prevent the stale dependencies UTF from correctly matching the file metadata against its dependencies.
To work around this, I've added the notion of a 'special' partition. These partitions are prefixed with an underscore and must be the leaf most nodes in the path. This makes it very easy to omit these form the path in the same way that we already omit file names.