# Fix: DeprecationHandler, correct isset(), ignore false phpstan positive
When the old property name is used, the 'isset' result was not tested on the property.
Also ignore a false positive from phpstan
# NEW: DolDeprecationHandler for deprecations
This reusable class avoids needed to implement double assignments while enabling
the detection of the use of deprecated variables and methods.
There is no efficiency overhead when the proper variables and methods are
used.
