Make CollectionUtils guarantee mutable return value. #11832
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Previously, they used Collectors.toList() which did not provide any such guarantee in its API docs, but behind-the-scenes was implemented as returning a mutable collection. As such, there's likely triplea code that depends on that implementation detail. This change makes that implementation detail an API guarantee. Also cleans up a couple code places that were copying the result and a few other clean ups.
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Change Summary & Additional Notes
Previously, they used Collectors.toList() which did not provide any such guarantee in its API docs, but behind-the-scenes was implemented as returning a mutable collection.
As such, there's likely triplea code that depends on that implementation detail. This change makes that implementation detail an API guarantee.
Also cleans up a couple code places that were copying the result and a few other clean ups.
Release Note