Make InternalGate hashable if all gate args are hashable #6294
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Currently
InternalGate
includes a dict in_value_equality_values_
, so it is never hashable even if all gate args are hashable. Change to use a frozenset of items instead to make it hashable. We also change to store constructor kwargs directly instead of copying the kwargs dict, since**kwargs
passed in to a function is always a unique dictionary which won't alias a caller's dict.