Merge putDtype and putType; remove duplicated code

[Noremos]

This is also a preparation for the JSON Type implementation

[Noremos]

If you not choose better names for methods you created to not duplicate code, I prefer to have the code duplicated. I understand nothing what the refactored methods do by their names.

I tried to follow the style of the original method names. putType and putDtype are not the most transparent names either. So it would be nice if you could suggest alternative names for my methods