Decoder doesn't display a type mismatch

[pdebakker-auguria]

We had a situation like

type WLB struct {
	Accessmask          []string `json:"accesmask"`
	...

But sometimes in our dataset, this field was actually just a string.
The error that the json.Decoder.decode() was json: slice unexpected end of JSON input.

Shouldn't the error be that the value doesn't have the expected type instead?