html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue https://github.com/pydata/xarray/issues/2789#issuecomment-467551453,https://api.github.com/repos/pydata/xarray/issues/2789,467551453,MDEyOklzc3VlQ29tbWVudDQ2NzU1MTQ1Mw==,4711805,2019-02-26T18:16:12Z,2019-02-26T18:17:26Z,CONTRIBUTOR,"An example involving only zarr (not xarray): ```python import zarr import numpy as np z1 = zarr.open('a.zarr', mode='w', shape=(1), chunks=(1), dtype='U6') z1[:] = 'foo' z2 = zarr.open('a.zarr', mode='a') z2.append(np.array(['barbar'], dtype='U6')) z3 = zarr.open('a.zarr', mode='r') print(z3[:]) ``` It works fine and prints `['foo' 'barbar']`, and the encoding is `""dtype"": ""