[master] 4ebc3cfec Make it possible to override the initial digest, and explain in a comment why it is not necessary.

[Nils Goroll]

Hi,

this thing happened when I did not have enough time to reflect, so just two
points on the way out:

- Do we need a way to fix the hash within vcl_recv?

  For example, if a backend decision has been made on the basis of the hash, we
do not want it to change any more.

- Should we bump the vcl version?

  We have done so for comparably less significant changes (see introduction of
UDS), and this definitely falls in the "semantic change without syntactic
change" category.

  Existing VCL could, for example, rely on vcl_hash to be called.

Nils

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