String leaf length constraints confused with range

[111pontes]

It seems that a string length constraint is implemented as a range constraint which generates this error:

2016-12-21 13:49:47,702 - ydk.providers.netconf_provider - INFO - NetconfServiceProvider connected to Router:None using ssh
2016-12-21 13:49:47,728 - ydk.services.executor_service - INFO - Executor operation initiated
2016-12-21 13:49:47,728 - ydk.services.executor_service - INFO - Executor operation completed
Traceback (most recent call last):
  File "./nc-execute-xr-snmp-test-trap-act-522-ydk.py", line 81, in <module>
    executor.execute_rpc(provider, routing_mpls_ldp_session_down_rpc)
  File "/usr/local/lib/python2.7/dist-packages/ydk/services/executor_service.py", line 57, in execute_rpc
    provider.sp_instance.encode_rpc(rpc),
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_provider_plugin.py", line 122, in encode_rpc
    self._encode_rpc_request(root, rpc)
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_provider_plugin.py", line 462, in _encode_rpc_request
    XmlEncoder().encode_to_xml(rpc, root, '')
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_encoder.py", line 89, in encode_to_xml
    self.encode_to_xml(value, elem, optype)
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_encoder.py", line 48, in encode_to_xml
    validate_entity(entity, optype)
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_validator.py", line 39, in validate_entity
    validate_entity_delegate(entity, optype, errors)
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_validator.py", line 69, in validate_entity_delegate
    _dm_validate_value(member, value, entity, optype, errors)
  File "/usr/local/lib/python2.7/dist-packages/ydk/providers/_validator.py", line 152, in _dm_validate_value
    errmsg = "Invalid data or data range, value = %d" % value
TypeError: %d format: a number is required, not str

Regardless, the documentation confuses length with range: