fix: decode error message

decoder.go

@@ -132,7 +132,7 @@ func (d *Decoder) setDefaults(t reflect.Type, v reflect.Value) MultiError {
 					//this check is to handle if the wrong value is provided
 					convertedVal := builtinConverters[f.typ.Elem().Kind()](val)
 					if !convertedVal.IsValid() {
-						errs.merge(MultiError{"default-" + f.name: errors.New("some elements in the slice are of a different type.")})
+						errs.merge(MultiError{"default-" + f.name: fmt.Errorf("failed setting default: %s is not compatible with field %s type", val, f.name)})
 						break
 					}
 					defaultSlice = reflect.Append(defaultSlice, convertedVal)