Sets the parameter value for key. Key must be one of the parameter keys passed on instantiation or added by a subclass.
parameter value (will be sliced)
parameter key (case insensitive)
val
Asserts that key is one of the parameter keys passed on instantiation or added by a subclass.
See Implementation
Sets the parameter value for key. Key must be one of the parameter keys passed on instantiation or added by a subclass.