Unable to set StringOut record values #40

# Import the basic framework components.
from softioc import softioc, builder, asyncio_dispatcher

# Create an asyncio dispatcher, the event loop is now running
dispatcher = asyncio_dispatcher.AsyncioDispatcher()

# Set the record prefix
builder.SetDeviceName("MY-DEVICE-PREFIX")

# Create some records
strout = builder.stringOut("FLIBBLE", initial_value="ABC")

# Boilerplate get the IOC started
builder.LoadDatabase()
softioc.iocInit(dispatcher)

strout.set("DEF")

# Finally leave the IOC running with an interactive shell.
softioc.interactive_ioc(globals())

 File "/home/eyh46967/dev/pythonSoftIoc/docs/examples/trial_stringout.py", line 17, in <module>
    strout.set("DEF")
  File "/home/eyh46967/dev/pythonSoftIoc/softioc/device.py", line 212, in set
    datatype, length, data, array = self.value_to_dbr(value)
  File "/home/eyh46967/dev/pythonSoftIoc/softioc/device.py", line 186, in value_to_dbr
    dbrtype = self.NumpyCharCodeToDbr[value.dtype.char]
KeyError: 'U'

value = numpy.require(value, requirements = 'C')