1 | initial version |

Apparently the symbolic ring considers that `SR(eq_z)`

is a constant.

Compare:

```
sage: p = (5*x^2-7*x+4)
sage: p.coefficients()
[[4, 0], [-7, 1], [5, 2]]
```

and

```
sage: R.<t> = PolynomialRing(ZZ)
sage: I = R.ideal([t^2-2])
sage: S.<z> = R.quotient_ring(I)
sage: eq_z = (z+1)^2-5; eq_z
2*z - 2
sage: a = SR(eq_z); a
2*z - 2
sage: a.coefficients()
[[2*z - 2, 0]]
```

So it's the constant `2*z-2`

times `x^0`

.

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