Tracking of dependency related bugs (pandas mostly):

[teto]

setting a whole column changes column dtype from "category" to "object"

• reading in chunks read_csv fails with TypeError: object cannot be converted to an IntegerDtype yet succeeds when reading chunks pandas-dev/pandas#25472
• Serialize/deserialize a Categorical whose values are taken from an enum pandas-dev/pandas#25448
• API: provide a to_enum method for Categorical dtypes? pandas-dev/pandas#16749
• object of type 'CategoricalDtype' has no len() pandas-dev/pandas#22262
• assigning a categorical may lose the categorical dtype setting a whole column changes column dtype from "category" to "object" pandas-dev/pandas#22361
• DataFrame.merge with empty frame and Int64 column gives object dtype pandas-dev/pandas#25183