[ANN] Clojure 1.9.0-alpha17

[Alex Miller]

Clojure 1.9.0-alpha17 is now available.

Try it via

- Download: https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-alpha17

- Leiningen: [org.clojure/clojure "1.9.0-alpha17"]

1.9.0-alpha17 includes the following changes since 1.9.0-alpha16:

- CLJ-1793 Clear 'this' before calls in tail position

- CLJ-2091 clojure.lang.APersistentVector#hashCode is not thread-safe

- CLJ-1860 Make -0.0 hash consistent with 0.0

- CLJ-2141 Return only true/false from qualified-* predicates

- CLJ-2142 Fix check for duplicate keys with namespace map syntax

- CLJ-2128 spec error during macroexpand no longer throws compiler exception with location

- Updated to use spec.alpha 0.1.123