A library that throws an ex-info envelope carrying a JVM :class (jolt.host/
tagged-table with a "class" entry — e.g. http-client's UnknownHostException on a
DNS failure) was caught only by a broad (catch Throwable …): (class e) read the
class but (instance? C e) — which catch dispatch lowers to — always returned
false, so clj-http-lite's (catch UnknownHostException e …) for :ignore-unknown-host?
never matched and the condition propagated.
Add an instance? arm matching such an envelope against the carried class or any
ancestor (full name or last segment), and register the common exception hierarchy
(Throwable/Exception/RuntimeException/IOException + the java.net socket/host
exceptions) so (catch IOException e) / (instance? Throwable e) also match. A
non-throwable class (RuntimeException over an IOException, String) stays false.
Fixes http-client's :ignore-unknown-host? test (116/0/0, was 1 error). make test
green, 0 new divergences. Runtime .ss, no re-mint.
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