sizeof command failed on ZFS enum

[sdimitro]

sdb> ptype zfs_uio_seg
enum zfs_uio_seg {
	UIO_USERSPACE = 0,
	UIO_SYSSPACE = 1,
	UIO_BVEC = 2,
	UIO_ITER = 3,
}
sdb> sizeof zfs_uio_seg
sdb encountered an internal error due to a bug. Here's the
information you need to file the bug:
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Target Info:
	ProgramFlags.IS_LIVE|IS_LINUX_KERNEL
	Platform(<Architecture.X86_64: 1>, <PlatformFlags.IS_LITTLE_ENDIAN|IS_64_BIT: 3>)

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/sdb/internal/repl.py", line 107, in eval_cmd
    for obj in invoke(self.target, [], input_):
  File "/usr/lib/python3/dist-packages/sdb/pipeline.py", line 147, in invoke
    yield from execute_pipeline(first_input, pipeline)
  File "/usr/lib/python3/dist-packages/sdb/pipeline.py", line 84, in execute_pipeline
    yield from massage_input_and_call(pipeline[-1], this_input)
  File "/usr/lib/python3/dist-packages/sdb/pipeline.py", line 43, in massage_input_and_call
    yield from cmd.call(objs)
  File "/usr/lib/python3/dist-packages/sdb/command.py", line 329, in call
    result, not issubclass(self.__class__, SingleInputCommand))
  File "/usr/lib/python3/dist-packages/sdb/command.py", line 290, in __invalid_memory_objects_check
    for obj in objs:
  File "/usr/lib/python3/dist-packages/sdb/commands/sizeof.py", line 60, in _call
    yield sdb.create_object('size_t', sdb.type_canonicalize_size(type_))
  File "/usr/lib/python3/dist-packages/sdb/target.py", line 141, in type_canonicalize_size
    return int(type_canonicalize(type_).size)
AttributeError: enum type does not have a size
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