9.4 enabling INTERNAL MALLOC at runtime

[Jeffrey Reasoner]

I am aware that this is an option with bind 9.4, and expected that the
syntax to turn it on would be relatively easy to find. However after
searching the ARM, MARC, googling, and checking the installed manpages
as well as those on isc.org, I am unable to track this down.
I suspect it is implemented as the -m argument to named, but this
doesn't seem to appear in the docs.
Has the documentation possibly not been updated in this regard? Also,
what is the syntax to turn this on at runtime?
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