Improve parsing of empty nulls and lists of objects #18
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Use bounded lookahead to improve parsing of lists of objects and empty keys that should parse as null. Previously an empty key would parse as an object that contained keys that should have been siblings. Includes an expanded test of null parsing and a hie.yaml file that occurred in the wild and did not parse correctly.
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Use lookahead to improve parsing of empty keys that should be parsed as null and lists consisting of items.
All current tests pass, and the null test has been expanded to include cases that would fail without this code.