fecho = tvm_ffi.get_global_func("testing.echo")
s = tvm_ffi.String("hello")
assert isinstance(s, tvm_ffi.String)
s2 = fecho(s)
assert s2.__tvm_ffi_object__.same_as(s.__tvm_ffi_object__)

s3 = tvm_ffi.convert("hello")
assert isinstance(s3, tvm_ffi.String)
assert isinstance(s3, str)

s4 = pickle.loads(pickle.dumps(s))
assert s4 == "hello"
assert isinstance(s4, tvm_ffi.String)

fecho = tvm_ffi.get_global_func("testing.echo")
b = tvm_ffi.Bytes(b"hello")
assert isinstance(b, tvm_ffi.Bytes)
b2 = fecho(b)
assert b2.__tvm_ffi_object__.same_as(b.__tvm_ffi_object__)

b3 = tvm_ffi.convert(b"hello")
assert isinstance(b3, tvm_ffi.Bytes)
assert isinstance(b3, bytes)

b4 = tvm_ffi.convert(bytearray(b"hello"))
assert isinstance(b4, tvm_ffi.Bytes)
assert isinstance(b4, bytes)

b5 = pickle.loads(pickle.dumps(b))
assert b5 == b"hello"
assert isinstance(b5, tvm_ffi.Bytes)