Is this the canonical form of the Schwartzian Transform or a variant?

Yes, it can be considered as the canonical form of the Schwartzian Transform. The original ST that appeared in a newsgroup more than 15 years ago might not have worked on fila age (I don't remember), but, definitely, the "output_array = map {block} sort {block} map {block} input array" is the canonical form of the Schwartzian Transform.

In reply to Re^3: Understanding the Schwartzian transform. by Laurent_R
in thread Understanding the Schwartzian transform. by Anonymous Monk

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