This method is defined only if at least one of the allocators defines
it. If SmallAllocator defines expand and b.length +
delta <= threshold, the call is forwarded to SmallAllocator. If LargeAllocator defines expand and b.length > threshold, the
call is forwarded to LargeAllocator. Otherwise, the call returns
false.
This method is defined only if at least one of the allocators defines it. If SmallAllocator defines expand and b.length + delta <= threshold, the call is forwarded to SmallAllocator. If LargeAllocator defines expand and b.length > threshold, the call is forwarded to LargeAllocator. Otherwise, the call returns false.