How libgmalloc work with two level namespaces?

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I want to write my own malloc/free functions with debug purposes, documentation says I have to use DYLD_FORCE_FLAT_NAMESPACE together with DYLD_INSERT_LIBRARIES. But at the same time libgmalloc article clearly states:

libgmalloc is available in /usr/lib/libgmalloc.dylib.  To use it, set this environment variable:
       set DYLD_INSERT_LIBRARIES to /usr/lib/libgmalloc.dylib
 Note:  it is no longer necessary to set DYLD_FORCE_FLAT_NAMESPACE.

The question is: how to remove the necessity in DYLD_FORCE_FLAT_NAMESPACE ? malloc from my own library is not used if I don't force the namespace flatness.

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