The parted manual says the format for the mkpart command is

              mkpart [part-type name fs-type] start end

which is correct, especially because it clarifies that gpt labels,
among others, don't use part-type.

Within parted, however, the "help mkpart" command yields this (wrong)
information, which leads to baffling behavior from parted:

   (parted) help mkpart
     mkpart PART-TYPE [FS-TYPE] START END     make a partition
   
    PART-TYPE is one of: primary, logical, extended
           FS-TYPE is one of: udf, btrfs, nilfs2, ext4, ext3, ext2, f2fs,
   fat32,
           fat16, hfsx, hfs+, hfs, jfs, swsusp, linux-swap(v1), linux-
   swap(v0),
           ntfs, reiserfs, hp-ufs, sun-ufs, xfs, apfs2, apfs1, asfs,
   amufs5,
           amufs4, amufs3, amufs2, amufs1, amufs0, amufs, affs7, affs6,
   affs5,
           affs4, affs3, affs2, affs1, affs0, linux-swap, linux-swap(new),
           linux-swap(old)
           START and END are disk locations, such as 4GB or 10%.  Negative
   values
           count from (parted) help mkpart
   mkpart PART-TYPE [FS-TYPE] START END make a partition
   
   PART-TYPE is one of: primary, logical, extended
   FS-TYPE is one of: udf, btrfs, nilfs2, ext4, ext3, ext2, f2fs, fat32,
   fat16, hfsx, hfs+, hfs, jfs, swsusp, linux-swap(v1), linux-swap(v0),
   ntfs, reiserfs, hp-ufs, sun-ufs, xfs, apfs2, apfs1, asfs, amufs5,
   amufs4, amufs3, amufs2, amufs1, amufs0, amufs, affs7, affs6, affs5,
   affs4, affs3, affs2, affs1, affs0, linux-swap, linux-swap(new),
   linux-swap(old)
   START and END are disk locations, such as 4GB or 10%. Negative values
   count from the end of the disk. For example, -1s specifies exactly the
   last sector.
   'mkpart' makes a partition without creating a new file system on the
   partition. FS-TYPE may be specified to set an appropriate partition
   ID.
   (parted)the end of the disk.  For example, -1s specifies exactly the
           last sector.
           
           'mkpart' makes a partition without creating a new file system
   on the
           partition.  FS-TYPE may be specified to set an appropriate
   partition
           ID.
   (parted) 
   

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