ci: a push cancels its branch's older run, checkout keeps no token (closes #216)
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watcher tests: far fewer live queries, longer live attempts (closes #214)
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docker: a plain docker build . stamps the git version (closes #210)
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resolver: never resend a refused query asking for recursion (closes #206)
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config: watch a target listed twice only once (closes #207)
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watcher: follow a watched name's CNAME for port and TLS checks (closes #203)
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watcher: warn of an expiring certificate on every TLS check (closes #204)
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README: correct claims the code does not bear out (closes #108)
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resolver: take a domain's NS set from its delegation (closes #200)
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resolver: pass over a server that answers SERVFAIL or refers no closer (closes #197)
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resolver: try servers in a random order on each resolution (closes #138)
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docs: add the README sections policy requires (closes #173)
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fmt: format and check Markdown with prettier in a container (closes #119)
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watcher: keep port state when no nameserver of a name answered (closes #193)
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resolver: error from ResolveIPAddresses when no nameserver answered (closes #190)
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fmt: check goimports in fmt-check, run it at its pinned commit (#119)
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resolver: query a hostname at its own zone's servers (closes #189)
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watcher: save and notify nothing for a cut-short port or TLS check (closes #185)
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watcher: notify nameserver address changes (closes #105)
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watcher: save state when it stops and wait for that save (closes #114)
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