Base of a tuple-like generic key.
A key with one key field.
A key with one key field.
The type of the field.
A key with two key fields.
A key with two key fields.
The type of the first field.
The type of the second field.
A key with two key fields.
A key with two key fields.
The type of the first field.
The type of the second field.
The type of the third field.
Base of a tuple-like generic key.
The type of the concrete key type.