chore(frontend/lean/pp_options): use consistent name convention for pp option names
refactor(library/logic/classes/decidable): rename 'decidable_eq_to_decidable' theorem to 'of_decidable_eq'
fix(frontends/lean/elaborator): missing constraint
feat(library/unifier): option 'unifier.computation true' will force elaborator to always consider an extra case-split when the right-hand-side of a flex-rigid constraint is not in weak-head-normal-form
refactor(library/unifier): move all_local outside of the class
fix(library/unifier): catch type error when checking is_def_eq of type incorrect expressions
feat(library/unifier): consider whnf case-split on flex-rigid constraints whenever the rhs contains a local constant that is not in the lhs