There's also scripted go, which may solve some of what you need.

Print debugging works for 99% of introspection needs. Most times go does just as advertised, though learn of common pitfalls to avoid.

Haskell has REPL and dynamic introspection, but everything takes 4-20 longer times. Maybe it's faster/better with massive practice.

Honestly, most codebases just sucks, including my own, unless you redo alot and put deliberate efforts over time. Which is irrelevant to sales (point in link). Alot of value in battle-tested code turns invisible too, locking knowledge away in obscurity. Go at least is pretty readable and mostly explicit.