Lacking Documentation on "Hair Attributes" material node

Basically other than Root UV I’m not entirely sure what these attributes are.

For example, Length is what? How is it giving me length information? In what form am I getting it so I can use it properly? Is it a UV per stand as total length? Or all strands normalized as length?

303306-image-hair-attributes.png

I’m shooting around in the dark trying to hit something. Basic documentation would be very appreciated.

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