Time has a limited set of allowed characters and so can bypass part of
the expensive checking done for valid JSON characters.

```
BenchmarkGet-12          	   10000	    111846 ns/op	   17273 B/op	     130 allocs/op
BenchmarkWatchHTTP-12    	   50000	     37830 ns/op	    1886 B/op	      29 allocs/op

BenchmarkGet-12          	   20000	    115917 ns/op	   17344 B/op	     130 allocs/op
BenchmarkWatchHTTP-12    	   50000	     36741 ns/op	    1775 B/op	      24 allocs/op
```

Can improve CRD watch performance by 5-10% for small objects.