add some basic notes for 1.12

Author: swannodette

devnotes/cljs-1.12.org

@@ -0,0 +1,34 @@
+ClojureScript 1.12 Dev Notes
+
+* Clojure 1.12 introduced method values in the following forms
+** `Classname/staticMethod` - existing static method descriptor
+** `Classname/.instancedMethod` - describes an instance method
+** `Classname/new` - describes a constructor
+* `Classname/staticMethod`
+** ClojureScript does not use JS class syntax to define anything
+** "static fields" are just properties on the ctor fn
+** However this could easily be detected by the compiler
+*** `(set! (.. Foo -prototype BAR) ...)`
+**** where `Foo` is a known deftype
+** Clojure can disambiguate between method/properties
+*** ClojureScript cannot in the general case
+**** foreign JS libraries
+*** It can work for Closure Compatible stuff
+**** due to externs parsing
+** Option: Could assume `Classname/staticMethod` fn
+*** CLJS doesn't support anything but namespaces before the `/`
+**** So minimal breakage likely
+* `Classname/.instanceMethod` no precendent so also easy to handle
+*  `Classname/new` a special case so easy to handle
+** Again `non-namespace/foo` never worked before
+* Other considerations
+** `^:param-tags`
+*** Don't immediately see a use for this
+**** We don't have the method selection problem
+** `goog.foo.Bar`
+*** Users do sometimes depend on global access to Closure libs
+*** externs parsing can let us know if `/` should be allowed or not
+** if something is `:referred` etc.
+*** Can also support `/`
+** `js/foo/bar`
+*** Not supported