UInt64 hash value for this object.
This method must have the property that
a == b implies
a.hash == b.hash.
The hash value is used along with
== by the
Hash class to determine if two objects reference the same hash key.
Subclasses must not override this method. Instead, they must define
hash(hasher), though usually the macro
def_hash can be used to generate this method.
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Licensed under the Apache License, Version 2.0.