Migrating ParameterHandler to a middleware system #139
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Currently the ParameterMapperInterface only allows for a handler to handle or not handle a parameter.
There is no way a ParameterMapper can "wrap" other parameter handlers. So there is no easy way to write a ParameterMapper that does validation upon the result of other parameter handlers.
This commit moves ParameterMapperInterface to a system of ParameterMiddlewareInterface where parameter middlewares are chained.
We therefore get all the benefits of middlewares when handling parameters.