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        root - the canonical root of the tree you're matching against
        cwd - the current working directory, if relevant
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        include - patterns to include
        exclude - patterns to exclude
        default - if a pattern in names has no explicit type, assume this one
        exact - patterns are actually literals

        a pattern is one of:
        'glob:<glob>' - a glob relative to cwd
        're:<regexp>' - a regular expression
        'path:<path>' - a path relative to canonroot
        'relglob:<glob>' - an unrooted glob (*.c matches C files in all dirs)
        'relpath:<path>' - a path relative to cwd
        'relre:<regexp>' - a regexp that needn't match the start of a name
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