Corrected an overly-specific type annotation.
Corrected an overly-specific type annotation.

`contains` passes the argument on to `equals`, which accepts anything,
so there's no reason to require anything more specific here.

Thanks to Michael Davidson for the fix.

aungzanbaw/gjstest,google/gjstest,aungzanbaw/gjstest,aungzanbaw/gjstest,google/gjstest,google/gjstest,google/gjstest,aungzanbaw/gjstest