do: func(c claims) (interface{}, error) {
				var s string
				err := c.unmarshalClaim("aud", &s)
				return s, err
			},
			want: "foo",
		},
		{
			name:   "mismatched types",
			claims: `{"aud":"foo"}`,
			do: func(c claims) (interface{}, error) {
				var n int
				err := c.unmarshalClaim("aud", &n)
				return n, err

			},
			wantErr: true,
		},
		{