feature request: allow changing ndarray WRITABLE flag after ndarray construction

I want to write a function which creates, fills, and returns an ndarray in C++. The ndarray owns its memory, but should be non-writable for the user. I would therefore like to clear the WRITABLE flag after I finished filling it in my function. I studied the header and I see no way of doing this right now, because flags are not writable after creating an ndarray. For most flags this makes sense, the WRITABLE flag seems to be the only one which you may want to change manually.

Is it possible to add this feature? Best regards!