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                   isHidden >>-isHidden---------------------------------------------------->< Returns .true ("1") if the absolute path of the target File object references an existing file or directory which is hidden. Otherwise returns .false ("0"). On Windows, a file or directory is hidden when its attribute FILE_ATTRIBUTE_HIDDEN is set. On Unix, a file or directory is hidden when its name starts with a period character (".") or when one of its parent directories has a name starting with a period character. Class FILE - isHidden method 
/* Unix, when file exists */
say .File~new("/tmp/file")~isHidden             -- 0
say .File~new("/tmp/.file")~isHidden            -- 1
say .File~new("/tmp/.dir/file")~isHidden        -- 1
                  
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