```rust use orgize::{Org, ast::Timestamp}; let t = Org::parse("[2000-01-01 -3y]").first_node:: ().unwrap(); assert_eq!(t.warning_value(), Some(3)); let t = Org::parse("[2000-01-01]--[2000-01-02 -5w]").first_node:: ().unwrap(); assert_eq!(t.warning_value(), Some(5)); let t = Org::parse("[2000-01-01 01:00-02:00 --10m]").first_node:: ().unwrap(); assert_eq!(t.warning_va
(&self)
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