public Builder putRegionSpecialCases(String region, List<RegionSpecialCase> regionSpecialCases) {
            this.regionSpecialCases.get().put(region, regionSpecialCases);
            return this;
        }
Sets the list of region special cases for a region.

@param region the region to use
@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