PrestatDir 
    WASI Preview1 type $prestat_dir
The contents of a prestat when type is preopentype::dir.
Parameters
prNameLen  
The length of the directory name for use with fd_prestat_dir_name.
Definition:
(typename $prestat_dir
  (record
    ;;; The length of the directory name for use with `fd_prestat_dir_name`.
    (field $pr_name_len $size)
  )
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