Converted PathMappings to be an AbstractMap #9213
Merged
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This was primarily done to avoid surprise of the previous behavior of puts for a duplicate key being ignored.
The use of the AbstractMap class now provides javadoc and known/expected behavior for key methods.
The only significant behavior change is in the return type of some key methods, with the old/previous value replacing a boolean.
Some stream usage has also been replaced by the more efficient iterator.
Some methods provided by AbstractMap may not be efficient.