[go-nuts] how to write methods for a generic Matrix[float64 constrained by Addable]?

[Jason E. Aten]

New to generics... how can I write a method for a Matrix[float64] that uses 
a math function that expects a float64?   I get:

./slurp1.go:936:18: cannot use m.At(i, j) (value of type float64 
constrained by Addable) as float64 value in argument to math.IsNaN

Casting it to float64() does not change this error(!)

here is the essentials:

type Addable interface {
    ~complex128 | ~complex64 | ~float64 | ~float32 |
        ~byte | ~uint16 | ~uint32 | ~uint64 |
        ~int8 | ~int16 | ~int32 | ~int64 | ~int
}

type Matrix[T Addable] struct {
    Nrow int
    Ncol int
    Dat        []T
}
...
func (m *Matrix[float64]) NanToZero() {
    for i := 0; i < m.Nrow; i++ {
        for j := 0; j < m.Ncol; j++ {

            if math.IsNaN(m.At(i, j)) {  // line 936, where the error is; 
./slurp1.go:936:18: cannot use m.At(i, j) (value of type float64 
constrained by Addable) as float64 value in argument to math.IsNaN

                m.Set(i, j, 0)
            }
        }
    }
}

go version go1.20.6 linux/amd64

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