JsonParser should be capable of parsing keys not surrounded by "

JsonParser should be capable of parsing keys without ", assuming that they are of type String (as is done in JS), rather than rejecting them and requiring them to be surrounded with ".

As in:
`"{\"10729945\":{2:null},\"10730556\":{1:null},\"10729026\":{3:null}}"`

P.S. The benefit is 2 bytes less per key (e.g., 1 vs. "1") used in network traffic, thus making a small performance & bandwidth usage optimization, that would make a lot of apps better at once (given that this is a very generic thing).

Start by locating JsonParser and its parser tests. Determine how object keys are currently recognized, then add coverage for unquoted String keys while preserving quoted-key parsing; done means the supplied example parses successfully and existing valid JSON behavior remains unchanged.

Written by the indexing model from the issue text.