update

I currently have a very big hook, with dozens of useStates, lots of them have empty arrays which trigger unncesary re-renders. But I don't know which is the one doing it each time wdyr logs it's output. I get:

Re-rendered because of hook changes: 
[hook useState result]
...diff

When would be very useful for me is:

Re-rendered because of hook changes:
[hook useState result] 

tuf/ngclient/updater.py: Updater._persist_metadata():

    with open(os.path.join(self._dir, f"{rolename}.json"), "wb") as f:
        f.write(data)

this is not as safe as it should be (as file could be corrupted midway through). This should work:

• write content to tempfile
• use sslib_util.persist_temp_file() to move tempfile to correct filepath

If CPM_SOURCE_CACHE is set to an empty string, CPM fails with file DOWNLOAD error: cannot create directory '/cpm' - Specify file by full.

The demo apps are not straight-forward, a very basic hello world example would be great :)
thanks

pipupgrade --verbose (0|1|2..) for info, warning, error, etc.