[WIP] Test into

Changed one function around. Wasnt working before, fixed it, added chunksize argument. Not sure if we want this to be a pattern, where we add chunksize arguments for functions which use chunks.

Also the code looks ugly and can probably be done better. 
also no need to do `float(i)` if the dtype is `('y', 'int32')`, it'll just get coerced on construction