When responding from DNS cache, let's slightly tweak how the TTL is lowered: as before let's round down when converting from our internal µs to the external seconds. (This is preferable, since records should better be cached too short instead of too long.) Let's avoid rounding down to zero though, since that has special semantics in many cases (in particular mDNS). Let's just use 1s in that case.
System and Service Manager
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