resize content, not type

Hi all,

for the resize function the ctypes tutorial states:

> Another way to use variable-sized data types with ctypes is to use the dynamic
> nature of Python, and (re-)define the data type after the required size is already
> known, on a case by case basis.

What does this mean? I tried monkey-patching the __class__ attribute,
also changing the _length_ attribute, but to no avail. This is not
surprising as the relevant length attribute is part of the C-side
object state, which doesn't seem to be exposed to the python API and
won't change just because I changed the type after construction.

Another option is to resize and then create a new array from_address,
but it won't own the memory so it's a problematic approach.

Cheers
--
Carlos

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