print uint's in decimal?

[Dieterbe]

Hello. Great library! I enjoy using it in my unit tests.
Just one request:
This program:

package main

import (
	"fmt"

	"github.com/google/go-cmp/cmp"
)

func main() {
	fmt.Println(cmp.Diff(uint32(42), uint32(4)))
}

prints:

  uint32(
- 	0x2a,
+ 	0x04,
  )

this is hard to understand for humans. It would be nice if there was a mode to print these numbers in decimal form.

[dsnet]

In the past, the choice to use hexadecimal was to ensure []byte (which is really an alias for []uint8) printed in hexadecimal form, but I agree that it causes standalone unsigned integers to print in sub-par fashion. Perhaps we should always print unsigned integers in decimal form and special case []uint8 instead.

[Dieterbe]

that seems pretty reasonable