Hello,
single reals can be represented in RIF. But they are not elements
of that field, right? Due to some code quirks (discussed in #12984)
we have at the moment:
sage: 1/2 in RIF
True
sage: 1/5 in RIF
False
sage: 3.14 in RIF
True
sage: 3 in RIF
True
sage: pi in RIF
False

As this behaviour is a RIF specialty it is more effective (and better 
design)
to implement a dedicated RIF.__contains__ method than to fix
the quirky Parent.__contains__. But what should be "in RIF"?
Only intervals? Intervals and reals?

Regards,

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