Hey gang,
Metadata support for pure Java objects is not currently supported, because
it requires a modification to the object. Additionally, only some Clojure
objects support metadata, due to the necessity of implementing the IMeta
interface. This can be confusing for new users, and eliminates some of the
utility.
Instead of attaching the metadata directly to the object, what if the
metadata was stored outside the object, in a global map of {object metadata,
...}? In order to handle garbage collection, something similar to Java's
WeakHashMap could be used, with the object itself as the key.
I know global state is Considered Harmful, but I think this would clarify
the usage of metadata, and remove duplication in the implementation of
Clojure.
Thoughts?
Stu
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