RxJava 1 development is phased out over time (Feature freeze in June 2017, EOL in March 2018) and we don't want to ship newly developed first-class support for libraries known to be no longer maintained. RxJava 1 type adoption support is not affected. Single and Observable can be still used in user-space code declaration, also copies of RxJava1CrudRepository (in user-space code) remain working.
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