Abstraction and application of stability of terms (i. e., the derivative of a stable term is its nil change in any honest environment)
Abstraction and application of stability of terms
(i. e., the derivative of a stable term is its nil change in any
honest environment)

Caution: Validity assumption is introduced into the close-enough
relation. An optimized derivative expecting volatility will NOT be
propositionally equal to the original derivative. They will only
act identically on consistent Δ-environments and valid future
argument pairs.

Old-commit-hash: b34946276b4d9fed70d1a900dfef8c90df0bb7ad

inc-lc/ilc-agda