Right now Sage can convert seamlessly between polynomial rings and symbolic 
ring. I am trying to extend this ability to Laurent polynomial rings.

I have already worked out the conversion to symbolic ring, by defining a 
method called _symbolic_ in the LaurentPolynomial classes. But now I am not 
sure which whould be the right way to proceed. I have considered the 
following options:

1) Modifying the LaurentPolynomialRing to declare a convert_method_name 
during creation, and then implement this convert method in symbolic 
expressions.

2) Modify the element constructor of LaurentPolynomials to check if the 
input is a symbolic expression and then try to construct the polynomial 
from it.

Which is the recommended one?

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