>>> I have a patch for this.. it adds two more malloc options 'w' and
>>> 'W' to turn on and off (respectively) malloc warnings, defaulting
>>> to off.

I think this is the right way: don't print unless it is specifically
requested by one of the options channels.

> These warnings can be quiet useful, I think, during development.

Yes, which is a good reason to have them available; it is not a good
reason to have them default on.

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