It's hard to define what "coercion" would even mean in this case. The
manual mentions that it must be a ring homomorphism, but in this case
(RLF, RR, RIF) the mathematical ring is all the same, namely "the real
numbers". It is only the implementation of the ring which is different.
I don't understand the following either:
sage: RealField(100).has_coerce_map_from(RealField(50))
False
sage: RealField(50).has_coerce_map_from(RealField(100))
True
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