Function value_type_of 

pub fn value_type_of(decl: &str) -> Option<ValueType>

Map a declared SQLite column type to the engine’s [ValueType], following SQLite type-affinity rules (with BOOLEAN/JSON special-cased, and the exact BIGINT/INT8 declarations mapped to the exact-i64 plane — design 226 §4.1). Returns None for BLOB and untyped columns — the engine’s OwnedValue has no Blob variant, so we reject rather than silently null them.

Other integer/NUMERIC columns map to Number, which the engine represents as f64 (Zero’s single numeric type). Schema admission and live capture reject INTEGER cells that do not round-trip exactly. Every integer through ±2^53 and selected larger values are exact; no admitted cell is silently rounded. Declare BIGINT/INT8 when the full i64 domain is required.