[OFF TOPIC] Zero delta ?

[Eneko Gotzon]

Sorry about this OT.

Please, somebody knows the meaning of the expression *zero delta*? It
appears in the following sentence:

*Netflix has made extensive contributions to the codebase and works to
maintain a zero delta
<http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/nutshell.html>
from mainline FreeBSD*.


In Internet I do not find any explanation.

Thank you.​

-- 
Eneko Gotzon Ares
enekogotzon at gmail.com
Tfn (+34) 943.273.431
Donostia, EUS
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