grpc-js-xds: Enable dualstack support by default

Author: murgatroid99

packages/grpc-js-xds/src/environment.ts

@@ -25,4 +25,4 @@ export const EXPERIMENTAL_FEDERATION = (process.env.GRPC_EXPERIMENTAL_XDS_FEDERA
 export const EXPERIMENTAL_CUSTOM_LB_CONFIG = (process.env.GRPC_EXPERIMENTAL_XDS_CUSTOM_LB_CONFIG ?? 'true') === 'true';
 export const EXPERIMENTAL_RING_HASH = (process.env.GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH ?? 'true') === 'true';
 export const EXPERIMENTAL_PICK_FIRST = (process.env.GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG ?? 'false') === 'true';
-export const EXPERIMENTAL_DUALSTACK_ENDPOINTS = (process.env.GRPC_EXPERIMENTAL_XDS_DUALSTACK_ENDPOINTS ?? 'false') === 'true';
+export const EXPERIMENTAL_DUALSTACK_ENDPOINTS = (process.env.GRPC_EXPERIMENTAL_XDS_DUALSTACK_ENDPOINTS ?? 'true') === 'true';