public static final java.lang.String PRESERVE_TARGET_CLASS_ATTRIBUTE
Bean definition attribute that may indicate whether a given bean is supposed
to be proxied with its target class (in case of it getting proxied in the first
place). The value is Boolean.TRUE or Boolean.FALSE.
Proxy factories can set this attribute if they built a target class proxy
for a specific bean, and want to enforce that bean can always be cast
to its target class (even if AOP advices get applied through auto-proxying).