pub const MAX_DEPTH: usize = 48;Expand description
Nesting levels of the REDUCED tree, after macro expansion (the root =
1): every reduced tree stays inside serde_json’s 128-level recursion
limit (2 JSON levels per node). The stack is never the bound: the
recursive passes grow it on the heap (crate::roomy/crate::deep;
tests/robustness.rs lays a 48-level surface out on a 128 KB thread).