Natural Numbers (un)curry Blow-Up

[agureev]

The current pipeline has good optimization going for it, especially with the STLC reducer. However, abstractly, the user may compiler some code with lambda subterms which are neither on the top nor being applied to. This will cause a huge blow-up that may not even withstand operations with 5-bit natural numbers, much less 24 or 32-bit ones.

We need to resolve this by either thinking about implementing primitive function types or changing the computation strategies for hom-object structures in Geb.