[rb-general] Clarification re SOURCE_BUILD_EPOCH and clamping

[Ximin Luo]

Chris Lamb:
> [..]
> 
> Short and concise as possible, please! It just needs to take a potential
> reader from "I have no idea what case this is addressing" to "oh it's
> something in this *rough* area", rather than explaining and justifying it
> in any depth whatsoever.
> 

Right, I wrote a version in one short paragraph in 8ecf58f, see what you think.

X

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