Also provide some basic implementation
The main purpose of these methods is optimization.
Most of the member scopes store mapping from names to descriptors
MemoizedFunction<Name, Collection<Descriptor>>
While there are 10 functions in class in average, there are a lot of
queries with names of non-existent functions, that leads to many
effectively redundant Map nodes in MemoizedFunction and also cause
additional computation that is worth to compute at once
Denis Zharkov
b1edb01dd4