Fix isequal for RationalFunctionFieldElem

... to delegate to isequal for the data

Author: fingolfin

src/generic/RationalFunctionField.jl

@@ -288,7 +288,7 @@ end
 
 function isequal(a::RationalFunctionFieldElem{T, U}, b::RationalFunctionFieldElem{T, U}) where {T <: FieldElement, U <: Union{PolyRingElem, MPolyRingElem}}
    check_parent(a, b)
-   return data(a) == data(b)
+   return isequal(data(a), data(b))
 end
 
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