Gst.Buffer does not have is_writable() and make_writable() methods

Gst.Buffer.is_writable() and Gst.Buffer.make_writable() are not available in the python API (http://lazka.github.io/pgi-docs/index.html#Gst-1.0/classes/Buffer.html#methods)

I also noticed that Gst.MiniObject.make_writable() is not available in python (http://lazka.github.io/pgi-docs/Gst-1.0/classes/MiniObject.html#methods).

Is this by design?

From the documentation I read that gst_buffer_make_writable() needs to be called when the buffer metadata like PTS/DTS is changed, maybe in python there are different assumptions and metadata can always be changed and these methods are not really needed?

I don't know how reference counting in handled from python, so this is more of a question than a bug report.

Thank you, Antonio