Question: old type `Poly{T}` -- replacement?

I just dug up some old code from 2020, or so, where I used the `Polynomials.jl` package.

One of my constructs doesn't work any more,

```julia
#
# Routine to find the vector of column degrees
#
function col_deg(M::Matrix{Poly{T}}) where T<:Number
return maximum(length.(coeffs.(M)),dims=1)[:].-1
end
```

Seems like `Poly{T}` doesn't exist any more.
* Has `Poly{T}` been replaced by another type?

Start with the `col_deg` example in the issue and inspect the current Polynomials.jl type definitions and `coeffs` entry point. Confirm which current type replaces `Poly{T}` and that the equivalent column-degree routine can use it.

Written by the indexing model from the issue text.