def for_context(context)
      contexts = hash.keys.select { |ckey| context.matches?([ckey]) }
      contexts.map { |exc| hash[exc] }
    end
def for_context(context)
      contexts = hash.keys.select { |ckey| context.matches?([ckey]) }
      contexts.map { |exc| hash[exc] }
    end
Find any overrides that match the supplied context