First checks whether there's enough slack memory preallocated for b
by evaluating b.length + delta <= goodAllocSize(b.length). If that's
the case, expands b in place. Otherwise, attempts to use
parent.expand appropriately if present.
structQuantizer(ParentAllocator, alias roundingFunction)
First checks whether there's enough slack memory preallocated for b by evaluating b.length + delta <= goodAllocSize(b.length). If that's the case, expands b in place. Otherwise, attempts to use parent.expand appropriately if present.