Igbinary is a drop in replacement for the standard php serializer. Instead of
the time and space consuming textual representation used by PHP's serialize(), igbinary stores php data
structures in a compact binary form. Savings are significant when using
memcached or similar memory based storages for serialized data.
* Throw when an uninitialized php 7.4 typed property is included in the result of __sleep(),
instead of emitting a notice and attempting to represent the unset/uninitialized value as null (#258).
Uninitialized properties without types from __sleep continue to emit notices and be represented as null.