protected open fun beforeChange( property: KProperty<*>, oldValue: T, newValue: T ): Boolean
The callback which is called before a change to the property value is attempted. The value of the property hasn't been changed yet, when this callback is invoked. If the callback returns
true the value of the property is being set to the new value, and if the callback returns
false the new value is discarded and the property remains its old value.
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