support time.Time serialization

[iivvoo]

jingo currently can't serialize time.Time. By default it will serialize to {}, and using stringify it won't give a proper ISO8601 (?) representation.

I've attempted to work around this using a fallback to the json.Marshaller interface (see #13 ) but explicitly supporting time.Time is more efficient and probably as effective.

[kungfusheep]

Thanks

From #13 (comment)

The Time package already offers support for AppendFormat([]byte, layout string) []byte, so if we had 1st class support we would be able to do so without the additional alloc needed by MarshalJSON.

I propose adding ptrTimeToBuf(unsafe.Pointer, *Buffer) to ptrconvert.go then adding a hook within the encoders to use that for time.Time.

The function would behave the same way the rest of the append functions in that file behave and would nominate time.RFC3339Nano as the layout. This then puts the output in-line with what you may expect from JSON.stringify within a browser.

[kungfusheep]

Cheers @johngillott

[johngillott]

No problem 👍 @kungfusheep