[CLJ-140] Single :tag for type hints conflates value's type with type of return value from an invoke Created: 01/Jul/09 Updated: 03/Sep/13
The value of a Var can be operated on directly, or, if it is a fn, it can be invoked and the resulting value operated on. :tag metadata on a Var is used to provide a type hint to the compiler to avoid reflection. Having a single metadata key for this two distinct uses makes it possible (even easy, if unlikely) to create a situation where type-hinting the value causes a ClassCastException on an operation on the invocation return value, or the reverse. The only obvious solution is two use different keys for the two uses.
|Comment by Assembla Importer [ 24/Aug/10 3:51 AM ]|
Converted from http://www.assembla.com/spaces/clojure/tickets/140