rootvector2 opened a new pull request, #718:
URL: https://github.com/apache/commons-collections/pull/718

   `SplitMapUtils.readableMap` returns a `WrappedGet` that implements 
`Unmodifiable` and blocks `clear`, `put` and `putAll`, but `remove(Object)` 
delegates to the wrapped `Get`, so the view deletes from the underlying map. 
The `Map` default methods that route through it inherit the hole, so `remove(k, 
v)`, `computeIfPresent`, `compute` and `merge` empty it just as well, and 
`UnmodifiableMap.unmodifiableMap` hands the view straight back on its 
`instanceof Unmodifiable` check, so re-wrapping does not close it. Found while 
auditing the library's `Unmodifiable` implementations for mutators that reach 
the delegate; every other one throws, so the fix stays inside `WrappedGet`.
   
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