[DO NOT MERGE] Test branch release/2.4.x
#287
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* allow `check-parse` command to read from stdin
* Adds open_attributes to the record type struct. When true, we assume a record with that type may have other attributes. When false it will have exactly the attributes specified in the type. * Record literals and records in schema are now closed. * Update has to use this new field. A has on a closed record will have type False if the attribute is not present.
The record LUB was incorrectly made Open even though the LUB attributes keys
match the input record attributes exactly. This happens only when the records
were not in a subtype relation because at least one pair of corresponding
attributes in the record were not in a subtype relation, but the pair of
attributes did have a least upper bound. For example, {a: true} and {a: false}.
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