Method find_primary_hash

perro_source/core/perro_csv/src/lib.rs:171–174

(&self, key_hash: u64)

        let name_hash = perro_ids::string_to_u64(name);
        self.headers
            .iter()
            .position(|cell| cell.hash == name_hash && cell.text == name)
    }

    /// Returns the first header with `name_hash`.
    ///
    /// Hash-only lookups cannot distinguish collisions. Use [`Self::header_index`] when the