The OrderedConfiguration and MappedConfiguration interfaces should allow for 
override() methods (similar to add()).
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                 Key: TAP5-437
                 URL: https://issues.apache.org/jira/browse/TAP5-437
             Project: Tapestry 5
          Issue Type: New Feature
            Reporter: Howard M. Lewis Ship


Currently, every time a service wants an overridable configuration, it is 
necessary to define two services and merge the configurations between the two, 
which is cumbersome.

It is quite common to want to override a single entry in a configuration. 

Overrides should be collected in parallel with adds, and applied at the end.  
Each override should match a specific contribution (by name for 
OrderedConfigration, but key for MappedConfiguration).  Overlapping overrides 
are an error.



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