decode,interp: Don't shadow _key and error on missing _key #757
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For fromjson and other "value" decode values fq make then behave both like a normal jq value and decode value. This is to make tobytes, format etc work. Before all _* would be treated as special keys. Now they are first looked up in the wrapped value and then as decode values.
Also now ._key that don't exist reutrn null instead of throw error.
$ fq -n '
{"_format": 123}
| fromjson | ._format' Now:123
Before:
"json"
$ fq -n '
{}
| fromjson | ._missing'Now:
null
Before
error