+/*
+ * Note that |extra| points to the correct client/server configuration
+ * within |test_ctx|. When configuring the handshake, general mode settings
+ * are taken from |test_ctx|, and client/server-specific settings should be
+ * taken from |extra|.
+ *
+ * The configuration code should never reach into |test_ctx->extra| or
+ * |test_ctx->resume_extra| directly.
+ *
+ * (We could refactor test mode settings into a substructure. This would result
+ * in cleaner argument passing but would complicate the test configuration
+ * parsing.)
+ */