Clojure 1.9.0-alpha20 is now available.

Try it via

- Download: https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-alpha20
- Leiningen: [org.clojure/clojure "1.9.0-alpha20"]

1.9.0-alpha20 includes the following changes since 1.9.0-alpha19:

- CLJ-1074 - (new) add new ## reader macro for symbolic values, and
                   read/print support for double vals ##Inf, ##-Inf, ##NaN
- CLJ-1454 - (new) add swap-vals! and reset-vals! that return both old and 
new values
- CLJ-2184 - (errors) propagate meta in doto forms to improve error 
reporting
- CLJ-2210 - (perf) cache class derivation in compiler to improve compiler 
performance
- CLJ-2070 - (perf) clojure.core/delay - improve performance
- CLJ-1917 - (perf) reducing seq over string should call String/length 
outside of loop
- CLJ-1901 - (perf) amap - should call alength only once
- CLJ-99   - (perf) min-key and max-key - evaluate k on each arg at most 
once
- CLJ-2188 - (perf) slurp - mark return type as String
- CLJ-2108 - (startup time) delay loading of spec and core specs (still 
more to do on this)
- CLJ-2204 - (security) disable serialization of proxy classes to avoid 
potential issue when deserializing
- CLJ-2048 - (fix) specify type to avoid ClassCastException when stack 
trace is elided by JVM
- CLJ-1887 - (fix) IPersistentVector.length() - implement missing method
- CLJ-1841 - (fix) bean - iterator was broken
- CLJ-1714 - (fix) using a class in a type hint shouldn't load the class
- CLJ-1398 - (fix) clojure.java.javadoc/javadoc - update doc urls
- CLJ-1371 - (fix) Numbers.divide(Object, Object) - add checks for NaN
- CLJ-1358 - (fix) doc - does not expand special cases properly (try, catch)
- CLJ-1705 - (fix) vector-of - fix NullPointerException if given 
unrecognized type
- CLJ-2170 - (doc) fix improperly located docstrings
- CLJ-2156 - (doc) clojure.java.io/copy - doc char[] support
- CLJ-2051 - (doc) clojure.instant/validated docstring - fix typo
- CLJ-2104 - (doc) clojure.pprint docstring - fix typo
- CLJ-2028 - (doc) filter, filterv, remove, take-while - fix docstrings
- CLJ-1873 - (doc) require, *data-readers* - add .cljc files to docstrings
- CLJ-1159 - (doc) clojure.java.io/delete-file - improve docstring
- CLJ-2039 - (doc) deftype - fix typo in docstring
- CLJ-1918 - (doc) await - improve docstring re shutdown-agents
- CLJ-1837 - (doc) index-of, last-index-of - clarify docstrings
- CLJ-1826 - (doc) drop-last - fix docstring
- CLJ-1859 - (doc) zero?, pos?, neg? - fix docstrings

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