public Builder regionSpecialCases(Map<String, List<RegionSpecialCase>> regionSpecialCases) {
            this.regionSpecialCases.clear();
            this.regionSpecialCases.get().putAll(regionSpecialCases);
            return this;
        }
Sets the region special cases.

@param regionSpecialCases Map of region string to list of {@link RegionSpecialCase}
@return Returns the builder.
smithy-aws-endpoints/src/main/java/software/amazon/smithy/rulesengine/aws/traits/StandardRegionalEndpointsTrait.java