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 * Keyword arguments are no longer allowed in index assignment
   (e.g. `a[0, kw: 1] = 2`).  [[Bug #20218]]
 
+* `GC.config` added to allow setting configuration variables on the Garbage
+  Collector [[Feature #20443]]
+
+* GC configuration parameter `rgengc_allow_full_mark` introduced. When `false`
+  GC will only mark young objects. Default is `true`. [[Feature #20443]]
+
 ## Core classes updates
 
 Note: We're only listing outstanding class updates.