jo: option to dedup object keys #143
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The JSON spec doesn't say anything about duplicate object keys, but many implementations either choke on them or quietly keep only the last value of each key. This PR maintains the `jo` default (duplicates preserved), but adds the `-D` option to deduplicate.
```bash
$ jo a=1 b=2 a=3
{"a":1,"b":2,"a":3}
$ jo -D a=1 b=2 a=3
{"a":3,"b":2}
$ jo -d . stage=$(jo 1=a 2=b 3=c) down=up stage.2=x stage\[3\]=y stage.4=d stage\[1\]=h
{"stage":{"1":"a","2":"b","3":"c","2":"x","3":"y","4":"d","1":"h"},"down":"up"}
$ jo -D -d . stage=$(jo 1=a 2=b 3=c) down=up stage.2=x stage\[3\]=y stage.4=d stage\[1\]=h
{"stage":{"1":"h","2":"x","3":"y","4":"d"},"down":"up"}
```
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The JSON spec doesn't say anything about duplicate object keys, but many implementations either choke on them or quietly keep only the last value of each key. This PR maintains the
jodefault (duplicates preserved), but adds the-Doption to deduplicate.$ jo a=1 b=2 a=3 {"a":1,"b":2,"a":3} $ jo -D a=1 b=2 a=3 {"a":3,"b":2} $ jo -d . stage=$(jo 1=a 2=b 3=c) down=up stage.2=x stage\[3\]=y stage.4=d stage\[1\]=h {"stage":{"1":"a","2":"b","3":"c","2":"x","3":"y","4":"d","1":"h"},"down":"up"} $ jo -D -d . stage=$(jo 1=a 2=b 3=c) down=up stage.2=x stage\[3\]=y stage.4=d stage\[1\]=h {"stage":{"1":"h","2":"x","3":"y","4":"d"},"down":"up"}