Implement ObjectSpace::WeakKeyMap basic allocator

[Feature #18498]

1 files changed, 6 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index 55925c6dcf..e655d615f4 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -20,6 +20,12 @@ Note: We're only listing outstanding class updates.
     * `String#unpack` now raises ArgumentError for unknown directives. [[Bug #19150]]
     * `String#bytesplice` now accepts new arguments index/length or range of the source string to be copied.  [[Feature #19314]]
 
+* ObjectSpace::WeakKeyMap
+
+    * New core class to build collections with weak references.
+      The class use equality semantic to lookup keys like a regular hash,
+      but it doesn't hold strong references on the keys. [[Feature #18498]]
+
 ## Stdlib updates
 
 The following default gems are updated.