  The new orthodoxy of quantum mechanics (QM) based on the decoherence approach
requires many-worlds as an essential ingredient for logical consistency, and
one may wonder what status to give to all these "other worlds". Here we
advocate that it is possible to build a consistent approach to QM where no
other worlds are needed, and where the quantum formalism appears as a
consequence of requiring the enumerability of physical properties. Such a
quantization hypothesis is closely related to indistinguishability, and is
deeply inconsistent with classical physics.
